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/verify/voltha-system-tests.yaml b/jjb/verify/voltha-system-tests.yaml
index ba934a5..d08ec2f 100644
--- a/jjb/verify/voltha-system-tests.yaml
+++ b/jjb/verify/voltha-system-tests.yaml
@@ -19,4 +19,7 @@
           dependency-jobs: 'verify_voltha-system-tests_tag-collision'
           unit-test-targets: 'lint'
           junit-allow-empty-results: true
-
+      - 'voltha-patch-test':
+          build-timeout: 20
+          pipeline: 'voltha-bbsim-tests.groovy'
+          dependency-jobs: 'verify_voltha-system-tests_unit-test'