Add sanity test for voltha-system-tests

- Also fix the comments-indentation lint error
- Checkout the gerrit patchset branch during the pipline stage.

Change-Id: Id98140dabf35c285fd1b967f94dfc311585621ed
diff --git a/jjb/opencord.yaml b/jjb/opencord.yaml
index a6668ae..42e7728 100644
--- a/jjb/opencord.yaml
+++ b/jjb/opencord.yaml
@@ -8,8 +8,8 @@
     blackduck-project: cord
 
     jobs:
-#     - 'synopsys-periodic-check':
-#         build-node: "ubuntu16.04-basebuild-2c-4g"
-#         git-server-url: "{gerrit-server-url}"
+      # - 'synopsys-periodic-check':
+      #    build-node: "ubuntu16.04-basebuild-2c-4g"
+      #    git-server-url: "{gerrit-server-url}"
       - 'synopsys-merge-check'