This is required to allow services to control what level they
should be logging out.

I've also taken the opportunity to update some of the tests to
make them cleaner and easier to read.

Co-authored-by: Peter Leitzen <pleitzen@gitlab.com>

feat: allows the configuration of the log level on the v2 log pkg

See merge request !263



Merged-by: Elliot Forbes <eforbes@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Igor <iwiedler@gitlab.com>
Reviewed-by: Peter Leitzen <pleitzen@gitlab.com>