Refactored all pipelines branches to external soft param

Change-Id: I3e451815029227f287aa1575099b0cd25b72433d
diff --git a/jenkins/client/init.yml b/jenkins/client/init.yml
index 5de6055..e4a3fcd 100644
--- a/jenkins/client/init.yml
+++ b/jenkins/client/init.yml
@@ -9,6 +9,7 @@
     jenkins_master_host: ${_param:control_vip_address}
     jenkins_master_port: 8081
     jenkins_aptly_storages: "local"
+    jenkins_pipelines_branch: "master"
   jenkins:
     client:
       master: