Cleanup: unify test helpers

[ycombinator]

Sometimes we need testing utilities that can be shared across packages. For example, see the SeedPRNG function.

Ideally, we'd be able to place such utilities in a _test.go file so they are not compiled into the production binary. However, this is not possible in golang.

The next best option seems to be using an internal package. To this end, we now have a beats/libbeat/internal folder. Any code that should be usable by packages rooted at beats/libbeat but not by packages outside it should go in here. This includes test helpers/utilities such as the aforementioned SeedPRNG function.

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.