Loading gitlab_net is slow

It seems that the following statement takes 100-200 ms on a Digital Ocean VM:

require_relative 'gitlab_reference_counter'

The main reason is that it has to run require_relative 'gitlab_net', which imports the Redis vendored library and httpunix, which appears to take the bulk of the time.

It seems that if we care about performance, we may want to rewrite the GitLab reference counter in Go.