Merge branch 'mg-keep-project-settings-expanded' into 'master'

Fix mirror settings anchor

See merge request gitlab-org/gitlab-ce!21261

app/views/projects/mirrors/_mirror_repos.html.haml

 - expanded = Rails.env.test?
 - protocols = Gitlab::UrlSanitizer::ALLOWED_SCHEMES.join('|')
 
-%section.settings.project-mirror-settings.js-mirror-settings.no-animate{ class: ('expanded' if expanded) }
+%section.settings.project-mirror-settings.js-mirror-settings.no-animate#js-push-remote-settings{ class: ('expanded' if expanded) }
   .settings-header
     %h4= _('Mirroring repositories')
     %button.btn.js-settings-toggle