DB initialization is broken when INFLUXDB_HTTP_AUTH_ENABLED is used

Tried it with `:1.5`, `:1.5-alpine`, `:1.4`, the log is more or less the same:

```
+ docker run --rm --name=influxdb -p 8086:8086 -p 2003:2003 -e INFLUXDB_DB=test -e INFLUXDB_HTTP_AUTH_ENABLED=1 -e INFLUXDB_ADMIN_USER=dbroot -v influxdb:/var/lib/influxdb influxdb:1.5
influxdb init process in progress...
ts=2018-05-12T12:49:22.247503Z lvl=info msg="InfluxDB starting" log_id=0816DeHl000 version=1.5.2 branch=1.5 commit=02d7d4f043b34ecb4e9b2dbec298c6f9450c2a32
ts=2018-05-12T12:49:22.247778Z lvl=info msg="Go runtime" log_id=0816DeHl000 version=go1.9.2 maxprocs=1
ts=2018-05-12T12:49:22.401471Z lvl=info msg="Using data dir" log_id=0816DeHl000 service=store path=/var/lib/influxdb/data
ts=2018-05-12T12:49:22.403338Z lvl=info msg="Open store (start)" log_id=0816DeHl000 service=store trace_id=0816Detl000 op_name=tsdb_open op_event=start
ts=2018-05-12T12:49:22.404857Z lvl=info msg="Open store (end)" log_id=0816DeHl000 service=store trace_id=0816Detl000 op_name=tsdb_open op_event=end op_elapsed=1.533ms
ts=2018-05-12T12:49:22.405348Z lvl=info msg="Opened service" log_id=0816DeHl000 service=subscriber
ts=2018-05-12T12:49:22.405759Z lvl=info msg="Starting monitor service" log_id=0816DeHl000 service=monitor
ts=2018-05-12T12:49:22.406430Z lvl=info msg="Registered diagnostics client" log_id=0816DeHl000 service=monitor name=build
ts=2018-05-12T12:49:22.406455Z lvl=info msg="Registered diagnostics client" log_id=0816DeHl000 service=monitor name=runtime
ts=2018-05-12T12:49:22.406492Z lvl=info msg="Registered diagnostics client" log_id=0816DeHl000 service=monitor name=network
ts=2018-05-12T12:49:22.406508Z lvl=info msg="Registered diagnostics client" log_id=0816DeHl000 service=monitor name=system
ts=2018-05-12T12:49:22.406746Z lvl=info msg="Starting precreation service" log_id=0816DeHl000 service=shard-precreation check_interval=10m advance_period=30m
ts=2018-05-12T12:49:22.407587Z lvl=info msg="Starting snapshot service" log_id=0816DeHl000 service=snapshot
ts=2018-05-12T12:49:22.407605Z lvl=info msg="Starting continuous query service" log_id=0816DeHl000 service=continuous_querier
ts=2018-05-12T12:49:22.407616Z lvl=info msg="Starting HTTP service" log_id=0816DeHl000 service=httpd authentication=true
ts=2018-05-12T12:49:22.407625Z lvl=info msg="opened HTTP access log" log_id=0816DeHl000 service=httpd path=stderr
ts=2018-05-12T12:49:22.407719Z lvl=info msg="Listening on HTTP" log_id=0816DeHl000 service=httpd addr=127.0.0.1:8086 https=false
ts=2018-05-12T12:49:22.407769Z lvl=info msg="Starting retention policy enforcement service" log_id=0816DeHl000 service=retention check_interval=30m
ts=2018-05-12T12:49:22.407885Z lvl=info msg="Listening for signals" log_id=0816DeHl000
ts=2018-05-12T12:49:22.409321Z lvl=info msg="Storing statistics" log_id=0816DeHl000 service=monitor db_instance=_internal db_rp=monitor interval=10s
ts=2018-05-12T12:49:22.410203Z lvl=info msg="Sending usage statistics to usage.influxdata.com" log_id=0816DeHl000
[httpd] 127.0.0.1 - - [12/May/2018:12:49:23 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e549969a-55e2-11e8-8001-000000000000 214
[httpd] 127.0.0.1 - - [12/May/2018:12:49:23 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e549c86b-55e2-11e8-8002-000000000000 280
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:24 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e5e4f81d-55e2-11e8-8003-000000000000 44
[httpd] 127.0.0.1 - - [12/May/2018:12:49:24 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e5e51759-55e2-11e8-8004-000000000000 97
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:25 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e67f8c18-55e2-11e8-8005-000000000000 73
[httpd] 127.0.0.1 - - [12/May/2018:12:49:25 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e67fb803-55e2-11e8-8006-000000000000 238
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:26 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e71ab3f7-55e2-11e8-8007-000000000000 45
[httpd] 127.0.0.1 - - [12/May/2018:12:49:26 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e71acfac-55e2-11e8-8008-000000000000 98
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:27 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e7b542ed-55e2-11e8-8009-000000000000 74
[httpd] 127.0.0.1 - - [12/May/2018:12:49:27 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e7b56ffb-55e2-11e8-800a-000000000000 156
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:28 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e85089df-55e2-11e8-800b-000000000000 55
[httpd] 127.0.0.1 - - [12/May/2018:12:49:28 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e850b055-55e2-11e8-800c-000000000000 132
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:29 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e8ec0567-55e2-11e8-800d-000000000000 44
[httpd] 127.0.0.1 - - [12/May/2018:12:49:29 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e8ec241a-55e2-11e8-800e-000000000000 89
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:30 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" e9875d04-55e2-11e8-800f-000000000000 132
[httpd] 127.0.0.1 - - [12/May/2018:12:49:30 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" e987a3d2-55e2-11e8-8010-000000000000 107
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:31 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" ea22f3c0-55e2-11e8-8011-000000000000 136
[httpd] 127.0.0.1 - - [12/May/2018:12:49:31 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" ea23483c-55e2-11e8-8012-000000000000 90
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:32 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" eabec11b-55e2-11e8-8013-000000000000 296
[httpd] 127.0.0.1 - - [12/May/2018:12:49:32 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" eabef722-55e2-11e8-8014-000000000000 106
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:33 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" eb595a51-55e2-11e8-8015-000000000000 54
[httpd] 127.0.0.1 - - [12/May/2018:12:49:33 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" eb598ea4-55e2-11e8-8016-000000000000 113
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:34 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" ebf3e5e3-55e2-11e8-8017-000000000000 72
[httpd] 127.0.0.1 - - [12/May/2018:12:49:34 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" ebf41298-55e2-11e8-8018-000000000000 163
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:35 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" ec8f1011-55e2-11e8-8019-000000000000 74
[httpd] 127.0.0.1 - - [12/May/2018:12:49:35 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" ec8f3b65-55e2-11e8-801a-000000000000 229
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:36 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" ed2a7332-55e2-11e8-801b-000000000000 44
[httpd] 127.0.0.1 - - [12/May/2018:12:49:36 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" ed2a9298-55e2-11e8-801c-000000000000 95
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:37 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" edc5c271-55e2-11e8-801d-000000000000 138
[httpd] 127.0.0.1 - - [12/May/2018:12:49:37 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" edc60ddf-55e2-11e8-801e-000000000000 94
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:38 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" ee6146af-55e2-11e8-801f-000000000000 130
[httpd] 127.0.0.1 - - [12/May/2018:12:49:38 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" ee61fb62-55e2-11e8-8020-000000000000 302
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:39 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" eefd7a0d-55e2-11e8-8021-000000000000 44
[httpd] 127.0.0.1 - - [12/May/2018:12:49:39 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" eefd9495-55e2-11e8-8022-000000000000 90
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:40 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" ef97d42b-55e2-11e8-8023-000000000000 53
[httpd] 127.0.0.1 - - [12/May/2018:12:49:40 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" ef97f5b1-55e2-11e8-8024-000000000000 128
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:41 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f03256cd-55e2-11e8-8025-000000000000 72
[httpd] 127.0.0.1 - - [12/May/2018:12:49:41 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f03283e3-55e2-11e8-8026-000000000000 163
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:42 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f0cd7a68-55e2-11e8-8027-000000000000 72
[httpd] 127.0.0.1 - - [12/May/2018:12:49:42 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f0cda3c3-55e2-11e8-8028-000000000000 159
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:43 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f168e1de-55e2-11e8-8029-000000000000 44
[httpd] 127.0.0.1 - - [12/May/2018:12:49:43 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f16900c3-55e2-11e8-802a-000000000000 96
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:44 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f204500c-55e2-11e8-802b-000000000000 130
[httpd] 127.0.0.1 - - [12/May/2018:12:49:44 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f2048158-55e2-11e8-802c-000000000000 98
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:45 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f29fb00b-55e2-11e8-802d-000000000000 130
[httpd] 127.0.0.1 - - [12/May/2018:12:49:45 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f2a02222-55e2-11e8-802e-000000000000 214
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:46 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f33b580f-55e2-11e8-802f-000000000000 137
[httpd] 127.0.0.1 - - [12/May/2018:12:49:46 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f33bcbf1-55e2-11e8-8030-000000000000 99
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:47 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f3d632fa-55e2-11e8-8031-000000000000 55
[httpd] 127.0.0.1 - - [12/May/2018:12:49:47 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f3d65222-55e2-11e8-8032-000000000000 125
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:48 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f470b703-55e2-11e8-8033-000000000000 73
[httpd] 127.0.0.1 - - [12/May/2018:12:49:48 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f470e29f-55e2-11e8-8034-000000000000 163
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:49 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f50be77f-55e2-11e8-8035-000000000000 72
[httpd] 127.0.0.1 - - [12/May/2018:12:49:49 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f50c12c2-55e2-11e8-8036-000000000000 219
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:50 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f5a74e96-55e2-11e8-8037-000000000000 49
[httpd] 127.0.0.1 - - [12/May/2018:12:49:50 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f5a77e7f-55e2-11e8-8038-000000000000 94
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:51 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f642dd86-55e2-11e8-8039-000000000000 44
[httpd] 127.0.0.1 - - [12/May/2018:12:49:51 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f642fc80-55e2-11e8-803a-000000000000 90
influxdb init process in progress...
[httpd] 127.0.0.1 - - [12/May/2018:12:49:52 +0000] "GET /ping HTTP/1.1" 204 0 "-" "InfluxDBShell/1.5.2" f6de3674-55e2-11e8-803b-000000000000 130
[httpd] 127.0.0.1 - - [12/May/2018:12:49:52 +0000] "POST /query?chunked=true&db=&epoch=ns&q=CREATE+DATABASE+test HTTP/1.1" 403 87 "-" "InfluxDBShell/1.5.2" f6de8a4b-55e2-11e8-803c-000000000000 98
influxdb init process in progress...
influxdb init process failed.
```
Without `INFLUXDB_HTTP_AUTH_ENABLED=1` it seems to work fine (but all `INFLUXDB_*_USER`s are not created).

No repository file or test is identified. Reproduce the shown Docker command with INFLUXDB_HTTP_AUTH_ENABLED, INFLUXDB_ADMIN_USER, and INFLUXDB_DB, then trace the container's initialization entry point and its authenticated database-creation request; done means initialization completes instead of repeatedly receiving HTTP 403 responses.

Written by the indexing model from the issue text.