batch tests do not support --influxdb parameter consistently

[DreadPirateShawn]

When passing --influxdb parameter to kapacitor-unit, the test data is created in the target destination, but the queries are executed against localhost.

Using the sample batch test data in this repo:

root@5604febba2a3:/kapacitor# cat ticks/alert_weather_batch.tick 
var weather = batch
    | query('''
        SELECT mean(temperature)
        FROM "weather"."default"."temperature"
        ''')
            .period(5m)
            .every(10m)

var rain = batch
    | query('''
        SELECT count(rain) 
        FROM "weather"."default"."temperature"
    ''')
        .period(5m)
        .every(3d)

// simple case with only one batch query

    weather
    | alert().id('Temperature')
        .message('Temperature alert - batch')
        .warn(lambda: "mean" > 80)
        .crit(lambda: "mean" > 100)
        .stateChangesOnly()
    .log('/tmp/temperature_batch.tick.log')

root@5604febba2a3:/kapacitor# cat test/sample.yaml
tests:
  # batch script
  - name: "Alert weather:: batch"  
    task_name: alert_weather_batch.tick
    db: weather
    rp: default
    type: batch
    data:
      - temperature,location=us-midwest temperature=110
      - temperature,location=us-midwest temperature=91
    expects:
      ok: 0
      warn: 0
      crit: 1

The run fails like so:

root@5604febba2a3:/kapacitor# kapacitor-unit --dir /kapacitor/ticks --kapacitor http://localhost:9092 --influxdb http://myinfluxdb1:8086 --tests /kapacitor/test/sample.yaml
  _                          _ _                                _ _            
 | |                        (_) |                              (_) |           
 | | ____ _ _ __   __ _  ___ _| |_ ___  _ __ ______ _   _ _ __  _| |_          
 | |/ / _` | '_ \ / _` |/ __| | __/ _ \| '__|______| | | | '_ \| | __|      
 |   < (_| | |_) | (_| | (__| | || (_) | |         | |_| | | | | | |_          
 |_|\_\__,_| .__/ \__,_|\___|_|\__\___/|_|          \__,_|_| |_|_|\__| 
           | |                                                                 
           |_|                                                                    
The unit test framework for TICK scripts (v0.9)

Processing batch script alert_weather_batch.tick...
ts=2020-02-25T19:09:28.008Z lvl=error msg="error executing query" service=kapacitor task_master=main task=alert_weather_batch.tick node=query1 err="Post http://localhost:8086/query?db=&q=SELECT+mean%28temperature%29+FROM+weather.%22default%22.temperature+WHERE+time+%3E%3D+%272020-02-25T19%3A04%3A28.007892268Z%27+AND+time+%3C+%272020-02-25T19%3A09%3A28.007892268Z%27: dial tcp 127.0.0.1:8086: connect: connection refused"
ts=2020-02-25T19:09:28.008Z lvl=error msg="error executing query" service=kapacitor task_master=main task=alert_weather_batch.tick node=query2 err="Post http://localhost:8086/query?db=&q=SELECT+count%28rain%29+FROM+weather.%22default%22.temperature+WHERE+time+%3E%3D+%272020-02-25T19%3A04%3A28.007889895Z%27+AND+time+%3C+%272020-02-25T19%3A09%3A28.007889895Z%27: dial tcp 127.0.0.1:8086: connect: connection refused"
ts=2020-02-25T19:09:29.008Z lvl=error msg="error executing query" service=kapacitor task_master=main task=alert_weather_batch.tick node=query2 err="Post http://localhost:8086/query?db=&q=SELECT+count%28rain%29+FROM+weather.%22default%22.temperature+WHERE+time+%3E%3D+%272020-02-25T19%3A04%3A29.007402193Z%27+AND+time+%3C+%272020-02-25T19%3A09%3A29.007402193Z%27: dial tcp 127.0.0.1:8086: connect: connection refused"
ts=2020-02-25T19:09:29.008Z lvl=error msg="error executing query" service=kapacitor task_master=main task=alert_weather_batch.tick node=query1 err="Post http://localhost:8086/query?db=&q=SELECT+mean%28temperature%29+FROM+weather.%22default%22.temperature+WHERE+time+%3E%3D+%272020-02-25T19%3A04%3A29.007404716Z%27+AND+time+%3C+%272020-02-25T19%3A09%3A29.007404716Z%27: dial tcp 127.0.0.1:8086: connect: connection refused"
ts=2020-02-25T19:09:30.008Z lvl=error msg="error executing query" service=kapacitor task_master=main task=alert_weather_batch.tick node=query1 err="Post http://localhost:8086/query?db=&q=SELECT+mean%28temperature%29+FROM+weather.%22default%22.temperature+WHERE+time+%3E%3D+%272020-02-25T19%3A04%3A30.007409273Z%27+AND+time+%3C+%272020-02-25T19%3A09%3A30.007409273Z%27: dial tcp 127.0.0.1:8086: connect: connection refused"
ts=2020-02-25T19:09:30.008Z lvl=error msg="error executing query" service=kapacitor task_master=main task=alert_weather_batch.tick node=query2 err="Post http://localhost:8086/query?db=&q=SELECT+count%28rain%29+FROM+weather.%22default%22.temperature+WHERE+time+%3E%3D+%272020-02-25T19%3A04%3A30.007407014Z%27+AND+time+%3C+%272020-02-25T19%3A09%3A30.007407014Z%27: dial tcp 127.0.0.1:8086: connect: connection refused"
2020/02/25 19:09:30 TEST Alert weather:: batch (alert_weather_batch.tick) FAIL
 Should have triggered 1 Critical alerts, triggered 0
 Alerts triggered (ok: 0, warn: 0, crit: 0)

Note http://localhost:8086/query?

But when I look at myinfluxdb1, I see the appropriate drop/create for each run:

highland@myinfluxdb1:~$ journalctl --since="3 hours ago" | grep weather | tail -n4
Feb 25 19:09:26 myinfluxdb1 influxd[1433]: ts=2020-02-25T19:09:26.977619Z lvl=info msg="Executing query" log_id=0KlPpmyl000 service=query query="CREATE DATABASE weather WITH DURATION 1h0m0s REPLICATION 1 NAME \"default\""
Feb 25 19:09:27 myinfluxdb1 influxd[1433]: [httpd] 192.168.0.17 - - [25/Feb/2020:11:09:27 -0800] "POST /write?db=weather&rp=default HTTP/1.1" 204 0 "-" "Go-http-client/1.1" 578b1f8f-5802-11ea-8e69-0050562ae7ac 23852
Feb 25 19:09:27 myinfluxdb1 influxd[1433]: [httpd] 192.168.0.17 - - [25/Feb/2020:11:09:27 -0800] "POST /write?db=weather&rp=default HTTP/1.1" 204 0 "-" "Go-http-client/1.1" 578ee596-5802-11ea-8e6a-0050562ae7ac 1111
Feb 25 19:09:30 myinfluxdb1 influxd[1433]: ts=2020-02-25T19:09:30.055504Z lvl=info msg="Executing query" log_id=0KlPpmyl000 service=query query="DROP DATABASE weather"