Handle Workflow in comment matching

Workflow statements modify the comment layout per

  "message": "Patch Set 2: Workflow-1\n\ncheck experimental",
  "message": "Patch Set 2: -Workflow\n\ncheck experimental",

So handle this in the comment checking

Change-Id: Iebeac180561b70837fb2ba58f686073be211befb
Merge "Handle Workflow in comment matching"