Move statsd metricbeat module to GA

[andresrc]

• Ensure the requirements are met.
• Move the module to GA

[mtojek]

Metricbeat Module / Dataset release checklist

This checklist is intended for Devs which create or update a module to make sure modules are consistent.

Modules

For a metricset to go GA, the following criterias should be met:

• Supported versions are documented
  Supported operating systems are documented (if applicable) (not related)
  Integration tests exist (would be same as system test)
• System tests exist
• Automated checks that all fields are documented
• Documentation
  Fields follow ECS and [naming conventions] (custom fields)(https://www.elastic.co/guide/en/beats/devguide/master/event-conventions.html)
  Dashboards exists (if applicable) (custom fields)
  Kibana Home Tutorial (if applicable) (no dashboard)
  Open PR against Kibana repo with tutorial. Examples can be found here.

Metricbeat module

• Example data.json exists and an automated way to generate it exists (go test -data)
  Test environment in Docker exist for integration tests (docker image is not required here)

[mtojek]

All PRs merged. Resolving.