Revert "Merge branch 'zj-rename-gitalypb' into 'master'"

This reverts merge request !262 (merged)

It breaks locally, where gitlab-shell and Gitaly can't connect it seems. Futher triaging is required though, but in the mean time we should revert this.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55008#note_123153287