Update gerrit credentials value in vnf jobs

PROD-31174

Change-Id: I0836fe9896f0f9189fd83221233cd827ee94a0fe
diff --git a/jenkins/client/job/deploy/lab/mom_deploy.yml b/jenkins/client/job/deploy/lab/mom_deploy.yml
index c6bbbc5..f03b485 100644
--- a/jenkins/client/job/deploy/lab/mom_deploy.yml
+++ b/jenkins/client/job/deploy/lab/mom_deploy.yml
@@ -100,7 +100,7 @@
               default: "master"
             STACK_TEMPLATE_CREDENTIALS:
               type: string
-              default: "gerrit"
+              default: "${_param:jenkins_gerrit_credentials}"
             STACK_TEMPLATE_URL:
               type: string
               default: "${_param:jenkins_gerrit_url}/mk/heat-templates"