Merge branch 'skip_ad_check' into 'master'

Skip ad check

Fixes #181

See merge request !193

lib/gitlab/ldap/group.rb

@@ -37,7 +37,7 @@ module Gitlab
           member_uids.include?(user.uid)
         elsif member_dns.include?(user.dn)
           true
-        else
+        elsif Gitlab.config.ldap.active_directory
           adapter.dn_matches_filter?(user.dn, active_directory_recursive_memberof_filter)
         end
       end