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/cord-test/voltha.yaml b/jjb/cord-test/voltha.yaml
index 4b01b54..2b11e9d 100644
--- a/jjb/cord-test/voltha.yaml
+++ b/jjb/cord-test/voltha.yaml
@@ -41,7 +41,7 @@
           configurePod: true
           time: '1'
 
-     # flex pod1 test job - using voltha branch
+      # flex pod1 test job - using voltha branch
       - 'build_voltha_pod_test':
           testvm: 'qa-testvm-pod'
           config-pod: 'flex-ocp-cord'