Added gerrit change Verification validation

Change-Id: I731826f0723a682395fb65231e87315e2954f6c0
diff --git a/test-salt-formulas-pipeline.groovy b/test-salt-formulas-pipeline.groovy
index bfa38e6..159efe2 100644
--- a/test-salt-formulas-pipeline.groovy
+++ b/test-salt-formulas-pipeline.groovy
@@ -41,9 +41,12 @@
     stage("checkout") {
       if (gerritRef) {
         // job is triggered by Gerrit
-        def gerritChange = gerrit.getGerritChange(GERRIT_NAME, GERRIT_HOST, GERRIT_CHANGE_NUMBER, CREDENTIALS_ID)
+        def gerritChange = gerrit.getGerritChange(GERRIT_NAME, GERRIT_HOST, GERRIT_CHANGE_NUMBER, CREDENTIALS_ID, true)
+        // test if gerrit change is already Verified
+        if(gerrit.patchsetHasApproval(gerritChange.currentPatchSet,"Verified")){
+          common.successMsg("Gerrit change ${GERRIT_CHANGE_NUMBER} patchset ${GERRIT_PATCHSET_NUMBER} already has Verified, skipping tests") // do nothing
         // test WIP contains in commit message
-        if(gerritChange.commitMessage.contains("WIP")){
+        }else if(gerritChange.commitMessage.contains("WIP")){
           common.successMsg("Commit message contains WIP, skipping tests") // do nothing
         }else{
           // test if change aren't already merged
@@ -141,3 +144,4 @@
   }
   return buildNums
 }
+