Projects/Gitlab-shell: Make the default branch the real default.
Created by: Olipro
Gitlab will now tell gitlab-shell to update the HEAD pointer using the update-head command - this ensures that when performing a git clone, the branch you receive if none is specified will actually be the one you configured as default.
This also resolves breakage when your repo lacks any branch named "master.
Depends on commit Olipro/gitlab-shell@0cb0f8c
Fixes #3314