Add trigger for oc upstream mirroring

Change-Id: I595150cfd9e1bfa64b74401c1b4ef5c361552972
diff --git a/jenkins/client/job/opencontrail/git-mirrors/upstream.yml b/jenkins/client/job/opencontrail/git-mirrors/upstream.yml
index 0fa0491..fe1edcd 100644
--- a/jenkins/client/job/opencontrail/git-mirrors/upstream.yml
+++ b/jenkins/client/job/opencontrail/git-mirrors/upstream.yml
@@ -62,7 +62,18 @@
               github:
                 url: "https://github.com/Mirantis/{{name}}"
             trigger:
-              github:
+              gerrit:
+                project:
+                  contrail/{{name}}:
+                    branches:
+                      - master
+                message:
+                  build_successful: "Build successful"
+                  build_unstable: "Build unstable"
+                  build_failure: "Build failed"
+                event:
+                  ref:
+                    - updated
             param:
               SOURCE_URL:
                 type: string