gerritPatchsetCheckout: allow to disable GerritTriggerBuildChooser class

Change-Id: I45bc16b3688c90e9cbf93a419584b88e30ec82d5
diff --git a/src/com/mirantis/mk/Gerrit.groovy b/src/com/mirantis/mk/Gerrit.groovy
index d1c0a1c..3761789 100644
--- a/src/com/mirantis/mk/Gerrit.groovy
+++ b/src/com/mirantis/mk/Gerrit.groovy
@@ -16,6 +16,8 @@
  *          - withMerge, merge master before build
  *          - withLocalBranch, prevent detached mode in repo
  *          - withWipeOut, wipe repository and force clone
+ *          - GerritTriggerBuildChooser - use magic GerritTriggerBuildChooser class from gerrit-trigger-plugin.
+ *            By default,enabled.
  *        Gerrit properties like GERRIT_SCHEMA can be passed in config as gerritSchema or will be obtained from env
  * @param extraScmExtensions list of extra scm extensions which will be used for checkout (optional)
  * @return boolean result
@@ -48,13 +50,13 @@
     def path = config.get('path', "")
     def depth = config.get('depth', 0)
     def timeout = config.get('timeout', 20)
+    def GerritTriggerBuildChooser = config.get('useGerritTriggerBuildChooser', true)
 
     def invalidParams = _getInvalidGerritParams(config)
     if (invalidParams.isEmpty()) {
         // default parameters
         def scmExtensions = [
             [$class: 'CleanCheckout'],
-            [$class: 'BuildChooserSetting', buildChooser: [$class: 'GerritTriggerBuildChooser']],
             [$class: 'CheckoutOption', timeout: timeout],
             [$class: 'CloneOption', depth: depth, noTags: false, reference: '', shallow: depth > 0, timeout: timeout]
         ]
@@ -74,6 +76,11 @@
             scmUserRemoteConfigs.put('credentialsId',credentials)
         }
 
+        // Usefull, if we only need to clone branch. W\o any refspec magic
+        if (GerritTriggerBuildChooser) {
+            scmExtensions.add([$class: 'BuildChooserSetting', buildChooser: [$class: 'GerritTriggerBuildChooser']],)
+        }
+
         // if we need to "merge" code from patchset to GERRIT_BRANCH branch
         if (merge) {
             scmExtensions.add([$class: 'PreBuildMerge', options: [fastForwardMode: 'FF', mergeRemote: 'gerrit', mergeStrategy: 'DEFAULT', mergeTarget: gerritBranch]])