Fix test failure due to bad rebase, feedback:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6342/diffs#note_17043090

spec/workers/send_pipeline_notification_worker_spec.rb

@@ -5,7 +5,7 @@ describe SendPipelineNotificationWorker do
     create(:ci_pipeline,
            project: project,
            sha: project.commit('master').sha,
-           user: user,
+           user: pusher,
            status: status)
   end