Refactored all pipelines branches to external soft param

Change-Id: I3e451815029227f287aa1575099b0cd25b72433d
diff --git a/jenkins/client/job/deploy/lab/ironic.yml b/jenkins/client/job/deploy/lab/ironic.yml
index 8c397cf..f0b67e8 100644
--- a/jenkins/client/job/deploy/lab/ironic.yml
+++ b/jenkins/client/job/deploy/lab/ironic.yml
@@ -76,4 +76,5 @@
             script: ironic-node-provision-pipeline.groovy
             type: git
             url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+            branch: "${_param:jenkins_pipelines_branch}"
           type: workflow-scm