InfluxDB 2.0: The "beforeTime" for filtering runs to those scheduled before this time doesn't works [area/api]

The `/tasks/{taskID}/runs` is defined as:

```yaml
'/tasks/{taskID}/runs':
get:
tags:
- Tasks
summary: Retrieve list of run records for a task
parameters:
- $ref: '#/components/parameters/TraceSpan'
- in: path
name: taskID
schema:
type: string
required: true
description: ID of task to get runs for
- in: query
name: after
schema:
type: string
description: returns runs after specified ID
- in: query
name: limit
schema:
type: integer
minimum: 1
maximum: 100
default: 20
description: the number of runs to return
- in: query
name: afterTime
schema:
type: string
format: date-time
description: filter runs to those scheduled after this time, RFC3339
- in: query
name: beforeTime
schema:
type: string
format: date-time
description: filter runs to those scheduled before this time, RFC3339
responses:
'200':
description: a list of task runs
content:
application/json:
schema:
$ref: "#/components/schemas/Runs"
default:
description: unexpected error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
```

but even If I specify the `beforeTime` the result contains Runs from future:

```bash
-> GET
-> http://127.0.0.1:9999/api/v2/tasks/03be546b47bf2000/runs?beforeTime=2019-04-22T08%3A33%3A41.629Z

<- 200
<- OK
<- {
"links": {
"self": "/api/v2/tasks/03be546b47bf2000/runs",
"task": "/api/v2/tasks/03be546b47bf2000"
},
"runs": [{
"links": {
"logs": "/api/v2/tasks/03be546b47bf2000/runs/03be546bc33f2000/logs",
"retry": "/api/v2/tasks/03be546b47bf2000/runs/03be546bc33f2000/retry",
"self": "/api/v2/tasks/03be546b47bf2000/runs/03be546bc33f2000",
"task": "/api/v2/tasks/03be546b47bf2000"
},
"id": "03be546bc33f2000",
"taskID": "03be546b47bf2000",
"status": "success",
"scheduledFor": "2019-04-23T08:33:42Z",
"startedAt": "2019-04-23T08:33:42.175365406Z",
"finishedAt": "2019-04-23T08:33:42.231212953Z",
"log": [{
"time": "2019-04-23T08:33:42.157689383Z",
"message": "Started task from script: \"option task = {name: \\\"it task1556008421630-IT\\\", every: 1s} \\n from(bucket:\\\"my-bucket\\\") |\u003e range(start: 0) |\u003e last()\""
}, {
"time": "2019-04-23T08:33:42.210091685Z",
"message": "{\"total_duration\":9618755,\"compile_duration\":1934,\"queue_duration\":45788,\"plan_duration\":0,\"requeue_duration\":0,\"execute_duration\":9554126,\"concurrency\":0,\"max_allocated\":0,\"metadata\":{\"influxdb/scanned-bytes\":[0],\"influxdb/scanned-values\":[0]}}"
}, {
"time": "2019-04-23T08:33:42.220417708Z",
"message": "Completed successfully"
}]
}, {
"links": {
"logs": "/api/v2/tasks/03be546b47bf2000/runs/03be546cc0bf2000/logs",
"retry": "/api/v2/tasks/03be546b47bf2000/runs/03be546cc0bf2000/retry",
"self": "/api/v2/tasks/03be546b47bf2000/runs/03be546cc0bf2000",
"task": "/api/v2/tasks/03be546b47bf2000"
},
"id": "03be546cc0bf2000",
"taskID": "03be546b47bf2000",
"status": "success",
"scheduledFor": "2019-04-23T08:33:43Z",
"startedAt": "2019-04-23T08:33:43.188203286Z",
"finishedAt": "2019-04-23T08:33:43.260272305Z",
"log": [{
"time": "2019-04-23T08:33:43.172512105Z",
"message": "Started task from script: \"option task = {name: \\\"it task1556008421630-IT\\\", every: 1s} \\n from(bucket:\\\"my-bucket\\\") |\u003e range(start: 0) |\u003e last()\""
}, {
"time": "2019-04-23T08:33:43.219653458Z",
"message": "{\"total_duration\":20222384,\"compile_duration\":2033,\"queue_duration\":29911,\"plan_duration\":0,\"requeue_duration\":0,\"execute_duration\":20169786,\"concurrency\":0,\"max_allocated\":0,\"metadata\":{\"influxdb/scanned-bytes\":[0],\"influxdb/scanned-values\":[0]}}"
}, {
"time": "2019-04-23T08:33:43.229824294Z",
"message": "Completed successfully"
}]
}, {
"links": {
"logs": "/api/v2/tasks/03be546b47bf2000/runs/03be546db2ff2000/logs",
"retry": "/api/v2/tasks/03be546b47bf2000/runs/03be546db2ff2000/retry",
"self": "/api/v2/tasks/03be546b47bf2000/runs/03be546db2ff2000",
"task": "/api/v2/tasks/03be546b47bf2000"
},
"id": "03be546db2ff2000",
"taskID": "03be546b47bf2000",
"status": "success",
"scheduledFor": "2019-04-23T08:33:44Z",
"startedAt": "2019-04-23T08:33:44.150979514Z",
"finishedAt": "2019-04-23T08:33:44.218828723Z",
"log": [{
"time": "2019-04-23T08:33:44.140647441Z",
"message": "Started task from script: \"option task = {name: \\\"it task1556008421630-IT\\\", every: 1s} \\n from(bucket:\\\"my-bucket\\\") |\u003e range(start: 0) |\u003e last()\""
}, {
"time": "2019-04-23T08:33:44.19819544Z",
"message": "{\"total_duration\":30167656,\"compile_duration\":2421,\"queue_duration\":764879,\"plan_duration\":0,\"requeue_duration\":0,\"execute_duration\":29378900,\"concurrency\":0,\"max_allocated\":0,\"metadata\":{\"influxdb/scanned-bytes\":[0],\"influxdb/scanned-values\":[0]}}"
}, {
"time": "2019-04-23T08:33:44.206811616Z",
"message": "Completed successfully"
}]
}, {
"links": {
"logs": "/api/v2/tasks/03be546b47bf2000/runs/03be546ed53f2000/logs",
"retry": "/api/v2/tasks/03be546b47bf2000/runs/03be546ed53f2000/retry",
"self": "/api/v2/tasks/03be546b47bf2000/runs/03be546ed53f2000",
"task": "/api/v2/tasks/03be546b47bf2000"
},
"id": "03be546ed53f2000",
"taskID": "03be546b47bf2000",
"status": "success",
"scheduledFor": "2019-04-23T08:33:45Z",
"startedAt": "2019-04-23T08:33:45.333861026Z",
"finishedAt": "2019-04-23T08:33:45.375377284Z",
"log": [{
"time": "2019-04-23T08:33:45.302037656Z",
"message": "Started task from script: \"option task = {name: \\\"it task1556008421630-IT\\\", every: 1s} \\n from(bucket:\\\"my-bucket\\\") |\u003e range(start: 0) |\u003e last()\""
}, {
"time": "2019-04-23T08:33:45.356717471Z",
"message": "{\"total_duration\":9676719,\"compile_duration\":1941,\"queue_duration\":72577,\"plan_duration\":0,\"requeue_duration\":0,\"execute_duration\":9584063,\"concurrency\":0,\"max_allocated\":0,\"metadata\":{\"influxdb/scanned-bytes\":[0],\"influxdb/scanned-values\":[0]}}"
}, {
"time": "2019-04-23T08:33:45.365948938Z",
"message": "Completed successfully"
}]
}, {
"links": {
"logs": "/api/v2/tasks/03be546b47bf2000/runs/03be546fb6bf2000/logs",
"retry": "/api/v2/tasks/03be546b47bf2000/runs/03be546fb6bf2000/retry",
"self": "/api/v2/tasks/03be546b47bf2000/runs/03be546fb6bf2000",
"task": "/api/v2/tasks/03be546b47bf2000"
},
"id": "03be546fb6bf2000",
"taskID": "03be546b47bf2000",
"status": "success",
"scheduledFor": "2019-04-23T08:33:46Z",
"startedAt": "2019-04-23T08:33:46.217746274Z",
"finishedAt": "2019-04-23T08:33:46.285420547Z",
"log": [{
"time": "2019-04-23T08:33:46.204317964Z",
"message": "Started task from script: \"option task = {name: \\\"it task1556008421630-IT\\\", every: 1s} \\n from(bucket:\\\"my-bucket\\\") |\u003e range(start: 0) |\u003e last()\""
}, {
"time": "2019-04-23T08:33:46.263538827Z",
"message": "{\"total_duration\":35674928,\"compile_duration\":2012,\"queue_duration\":51129,\"plan_duration\":0,\"requeue_duration\":0,\"execute_duration\":35602705,\"concurrency\":0,\"max_allocated\":0,\"metadata\":{\"influxdb/scanned-bytes\":[0],\"influxdb/scanned-values\":[0]}}"
}, {
"time": "2019-04-23T08:33:46.274075399Z",
"message": "Completed successfully"
}]
}]
}
```

Start by locating the GET /tasks/{taskID}/runs API entry point and the handling of its beforeTime query parameter. Reproduce the request shown in the issue and inspect any existing tests for task-run filtering. Done means the response contains only runs scheduled before the supplied RFC3339 time.

Written by the indexing model from the issue text.