Make GitLab CE works with new gitlab_git

Recently we removed grit dependency from gitlab_git in favor of rugged.

This changes make GitLab works with new library.

Added 1 new commit:

• 4b65b0e0 - Fix wiki

Added 3 new commits:

• 424b42d6 - Fix 500 error on empty search in project
• 3a106cbc - Fix graphs
• 619c81b4 - Fix Commit stats and diff encoding issues

Added 2 new commits:

• 3bf316db - Fix security tests
• 66ef5c1a - Fix satellites

Added 1 new commit:

• eaeb4a90 - Fix branch API

Milestone changed to 7.4

mentioned in commit c8616728

mentioned in commit cb6b0747

Mentioned in commit c8616728