influxdbreceiver: Unexpected response status code

[perrinj3]

Describe the bug
The influxdbreceiver endpoint returns a "202 Accepted status code" instead of the expected "204 No Content" as defined from the InfluxDB API reference.

https://docs.influxdata.com/influxdb/v1.8/tools/api/#status-codes-and-responses-2

Steps to reproduce
The error occurs when K6 is configured to output test results to the InfluxdbReceiver endpoint. K6 expects a "HTTP/1.1 204 No Content" and when it gets"HTTP/1.1 202 Accepted" it reports this as a error which breaks the pipeline that runs the K6 test.

What did you expect to see?
HTTP/1.1 204 No Content

What did you see instead?
HTTP/1.1 202 Accepted

What version did you use?
Version: v0.4.0

What config did you use?

receivers:
  influxdb:
    endpoint: "0.0.0.0:8087"
          
exporters:
 
  file:
    path: ./jmeter_data.json 
 
service:
  pipelines:

   metrics:
     receivers: [influxdb]
     exporters: [file]

Environment
OS: Windows 2012

Additional context
Add any other context about the problem here.

[jpkrohling]

cc @jacobmarble, @8none1