Merge branch 'patch-1' into 'master'

GitLab 8.4 uses gitlab-shell v2.6.10

While upgrading to GitLab 8.3 to 8.4 there was a warning massage for using GitLab 8.3 with gitlab-shell v2.6.9 so I changed gitlab-shell version to v2.6.10 and it worked.

See merge request !2555