Use non-gerrit scm checkout for docker builds

Change-Id: Ieb7efc69f8db12479d14e9f425fe100051fff804
diff --git a/docker-build-image-pipeline.groovy b/docker-build-image-pipeline.groovy
index 770a296..11225ef 100644
--- a/docker-build-image-pipeline.groovy
+++ b/docker-build-image-pipeline.groovy
@@ -21,7 +21,9 @@
     def dockerApp
     docker.withRegistry(REGISTRY_URL, REGISTRY_CREDENTIALS_ID) {
       stage("checkout") {
-         gerrit.gerritPatchsetCheckout(IMAGE_GIT_URL, IMAGE_BRANCH, IMAGE_BRANCH, IMAGE_CREDENTIALS_ID)
+         checkout changelog: true, poll: false,
+           scm: [$class: 'GitSCM', branches: IMAGE_BRANCH, doGenerateSubmoduleConfigurations: false,
+           extensions: [[$class: 'CleanCheckout']],  submoduleCfg: [], userRemoteConfigs: [[credentialsId: IMAGE_CREDENTIALS_ID, url: IMAGE_GIT_URL]]]
       }
       stage("build") {
         common.infoMsg("Building docker image ${IMAGE_NAME}")