Add option to disable 'Request access' for project/group
Credit to @nick.thomas for the idea.
It would be nice to be able to disable the 'Request Access' feature for particular groups or projects. Case in point, users are beginning to request access to the
gitlab-ee repository on GitLab.com. Users should fork and submit MR that way so it's undesirable to have users requesting access. It's also a bad experience for them if they request access and we just deny it. We can't tell them why we're denying access.