Adding a notification step if docker-publish job fails

Change-Id: I0a81896fe67b3d9eeb1901ceb21113c6833e459f
diff --git a/jjb/defaults.yaml b/jjb/defaults.yaml
index 69b39fb..2cbdaef 100644
--- a/jjb/defaults.yaml
+++ b/jjb/defaults.yaml
@@ -182,3 +182,7 @@
     # skip directories
     # Used to skip directories in supported tests
     skip-dirs: ''
+
+    # maintainers
+    # Used to notify users in supported tests
+    maintainers: 'zdw@opennetworking.org'