Merge branch 'quarantine-flaky-specs' into 'master'

Quarantine a flaky spec in spec/features/issues/user_creates_branch_and_merge_request_spec.rb

See merge request gitlab-org/gitlab-ce!27202

spec/features/issues/user_creates_branch_and_merge_request_spec.rb

@@ -139,7 +139,7 @@ describe 'User creates branch and merge request on issue page', :js do
         visit project_issue_path(project, issue)
       end
 
-      it 'disables the create branch button' do
+      it 'disables the create branch button', :quarantine do
         expect(page).to have_css('.create-mr-dropdown-wrap .unavailable:not(.hidden)')
         expect(page).to have_css('.create-mr-dropdown-wrap .available.hidden', visible: false)
         expect(page).to have_content /Related merge requests/