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/maintenance-heat-cicd-pike-dvr-sl.yml b/jobs/templates/maintenance-heat-cicd-pike-dvr-sl.yml
index b0cfe1b..eb15717 100644
--- a/jobs/templates/maintenance-heat-cicd-pike-dvr-sl.yml
+++ b/jobs/templates/maintenance-heat-cicd-pike-dvr-sl.yml
@@ -192,6 +192,10 @@
         description: ''
         name: UPDATE_VERSION
         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: