Add support of DIST_UPGRADE_NODES parameter

Add support of DIST_UPGRADE_NODES option for
deploy_openstack job, so that virtual nodes get
latest upgrades during environment deployment
(if the option is enabled).

Change-Id: Idc0b6a12005a31e676e3380ca23ee486ab5adbdd
Related-Prod:PROD-34252
diff --git a/jobs/templates/heat-bm-cicd-pike-contrail-sl.yml b/jobs/templates/heat-bm-cicd-pike-contrail-sl.yml
index 69097ca..d4332b2 100644
--- a/jobs/templates/heat-bm-cicd-pike-contrail-sl.yml
+++ b/jobs/templates/heat-bm-cicd-pike-contrail-sl.yml
@@ -217,6 +217,10 @@
         description: ''
         name: BATCH_SIZE
         trim: 'false'
+    - bool:
+        default: false
+        description: Whether to perform dist-upgrade on virtual nodes during deployment
+        name: DIST_UPGRADE_NODES
     pipeline-scm:
       lightweight-checkout: false
       scm: