Users reporting unable to pull from their repositories via SSH

I suspect the problem is due to https://gitlab.com/gitlab-org/gitlab-ee/issues/3393; I'm not sure if this would affect git pulls, but definitely pushes. @reprazent, can you confirm?

Note that the exception was not obvious due a bug in our API exception handler. I had to do an experiment on git07 in https://gitlab.com/gitlab-org/gitlab-ce/issues/37680#note_39898839 to uncover this. I created https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14178 to solve this reporting problem.

Edited by Stan Hu