Merge branch 'rc-change-qa-namespace' into 'master'

QA group name, use hyphens rather than underscores

See merge request gitlab-org/gitlab-ce!14786

qa/qa/runtime/namespace.rb

@@ -8,7 +8,7 @@ module QA
       end
 
       def name
-        'qa_test_' + time.strftime('%d_%m_%Y_%H-%M-%S')
+        'qa-test-' + time.strftime('%d-%m-%Y-%H-%M-%S')
       end
 
       def sandbox_name