Quietly not launching HTTP endpoint?

Nobody has claimed this yet.

I'm suspecting that HTTP endpoint is quietly not being launched, without error warnings, possibly hanging somewhere for given configurations.

burrow.toml

```
[general]
pidfile="burrow.pid"

[logging]
level="info"
maxsize=100
maxbackups=30
maxage=10
use-localtime=false
use-compression=true

[zookeeper]
servers=[ ":2181" ]
timeout=6

[client-profile.test]
client-id="burrow-test"
kafka-version="0.10.0"
sasl="mysaslprofile"

[sasl.mysaslprofile]
username=""
password=""
handshake-first=true

[cluster.myclustername]
class-name="kafka"
servers=[ ":9093" ]
client-profile="test"

[httpserver.default]
address=":8000"

[storage.mystorage]
class-name="inmemory"
workers=20
intervals=15
expire-group=604800
min-distance=1
```
It *seems* like it launches without issue, stdout:

```
~/go/src/github.com/linkedin $ $GOPATH/bin/Burrow --config-dir ./Burrow/config
Reading configuration from ./Burrow/config
{"level":"info","ts":1563997959.8608692,"msg":"Started Burrow"}
{"level":"info","ts":1563997959.8609438,"msg":"configuring","type":"coordinator","name":"zookeeper"}
{"level":"info","ts":1563997959.861918,"msg":"configuring","type":"coordinator","name":"storage"}
{"level":"info","ts":1563997959.861952,"msg":"configuring","type":"module","coordinator":"storage","class":"inmemory","name":"mystorage"}
{"level":"info","ts":1563997959.862017,"msg":"configuring","type":"coordinator","name":"evaluator"}
{"level":"info","ts":1563997959.862039,"msg":"configuring","type":"module","coordinator":"evaluator","class":"caching","name":"default"}
{"level":"info","ts":1563997959.8620641,"msg":"configuring","type":"coordinator","name":"httpserver"}
{"level":"info","ts":1563997959.862123,"msg":"configuring","type":"coordinator","name":"notifier"}
{"level":"info","ts":1563997959.862133,"msg":"configuring","type":"coordinator","name":"cluster"}
{"level":"info","ts":1563997959.862148,"msg":"configuring","type":"module","coordinator":"cluster","class":"kafka","name":"myclustername"}
{"level":"info","ts":1563997959.8623722,"msg":"configuring","type":"coordinator","name":"consumer"}
{"level":"info","ts":1563997959.862384,"msg":"starting","type":"coordinator","name":"zookeeper"}
{"level":"info","ts":1563997960.5813189,"msg":"Connected to ","type":"coordinator","name":"zookeeper"}
{"level":"info","ts":1563997960.6514409,"msg":"Authenticated: id=72057596575088678, timeout=6000","type":"coordinator","name":"zookeeper"}
{"level":"info","ts":1563997960.651575,"msg":"Re-submitting `0` credentials after reconnect","type":"coordinator","name":"zookeeper"}
{"level":"info","ts":1563997960.6927612,"msg":"starting","type":"coordinator","name":"storage"}
{"level":"info","ts":1563997960.692883,"msg":"starting","type":"module","coordinator":"storage","class":"inmemory","name":"mystorage"}
{"level":"info","ts":1563997960.693038,"msg":"starting","type":"coordinator","name":"evaluator"}
{"level":"info","ts":1563997960.693064,"msg":"starting","type":"module","coordinator":"evaluator","class":"caching","name":"default"}
{"level":"info","ts":1563997960.693193,"msg":"starting","type":"coordinator","name":"httpserver"}
{"level":"info","ts":1563997960.6936588,"msg":"started listener","type":"coordinator","name":"httpserver","listener":"[::]:8000"}
{"level":"info","ts":1563997960.693727,"msg":"starting","type":"coordinator","name":"notifier"}
{"level":"info","ts":1563997960.6937861,"msg":"starting","type":"coordinator","name":"cluster"}
{"level":"info","ts":1563997960.6938088,"msg":"starting","type":"module","coordinator":"cluster","class":"kafka","name":"myclustername"}
{"level":"info","ts":1563997960.87871,"msg":"starting evaluations","type":"coordinator","name":"notifier"}
{"level":"info","ts":1563997962.428315,"msg":"starting","type":"coordinator","name":"consumer"}

```
It hangs here, which I interpret to mean that it's launched.

But all HTTP requests seem to indicate port 8000 was never opened, returning "ERR_CONNECTION_REFUSED"

`GET http://:8000/burrow/admin` is refused, with and without passing the following headers.

```
Content-Type: application/json
Authorization: Basic

```

Am I missing an indication of error, or just possibly overlooking another key requirement?

Start by reproducing the launch with the supplied burrow.toml configuration and checking whether the HTTP listener on :8000 is reachable from the requested host. Review the startup log around the httpserver and consumer coordinators, then verify the /burrow/admin request path. Done means the configured endpoint accepts an HTTP request rather than returning connection refused.

Written by the indexing model from the issue text.