Fix broken user_allowed check in Git Annex push
https://gitlab.com/gitlab-org/gitlab-ee/commit/3e4934cea6e2909fe978e5e38a659e4e6f818430 seems to have moveduser_allowed
into the UserAccess
class, but since no specs tested git_annex_access_check
a push from Git Annex would fail with an undefined method.
Closes #816 (closed)