Option to pass extra flags gerrit command in findGerritChange()

Related-To: PRODX-10059
Change-Id: I1b1329ab9829007ca23dc09472f9f036bda88184
diff --git a/src/com/mirantis/mk/Gerrit.groovy b/src/com/mirantis/mk/Gerrit.groovy
index 88da957..07c6b5d 100644
--- a/src/com/mirantis/mk/Gerrit.groovy
+++ b/src/com/mirantis/mk/Gerrit.groovy
@@ -320,11 +320,13 @@
  *                          HOST, PORT and USER
  * @param changeParams      Parameters to identify Geriit change e.g.: owner, topic,
  *                          status, branch, project
+ * @param extraFlags        Additional flags for gerrit querry for example
+ *                          '--current-patch-set' or '--comments' as a simple string
  */
-def findGerritChange(credentialsId, LinkedHashMap gerritAuth, LinkedHashMap changeParams) {
+def findGerritChange(credentialsId, LinkedHashMap gerritAuth, LinkedHashMap changeParams, String extraFlags = '') {
     scriptText = """
                  ssh -p ${gerritAuth['PORT']} ${gerritAuth['USER']}@${gerritAuth['HOST']} \
-                 gerrit query \
+                 gerrit query ${extraFlags} \
                  --format JSON \
                  """
     changeParams.each {