Get CI status when source and target project are different

Created by: 5kg

After created a merge request from a forked repo, it shows Cannot connect to CI server. Please check your setting on the merge request page.

This issue is probably related to:

• https://github.com/gitlabhq/gitlabhq/issues/4764#issuecomment-22614158
• https://groups.google.com/forum/#!topic/gitlabhq/EHxDsHCqKKo