Parametrize mcp_docker_registry host

Related-Bug: PROD-22480 (PROD:22480)

Change-Id: I36ad55a1960f6c8e025d9c967bbc7658927fc872
diff --git a/jenkins/client/job/deploy/rollout.yml b/jenkins/client/job/deploy/rollout.yml
index 3b05fd6..25b088d 100644
--- a/jenkins/client/job/deploy/rollout.yml
+++ b/jenkins/client/job/deploy/rollout.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    mcp_docker_registry: 'docker-prod-local.artifactory.mirantis.com'
   jenkins:
     client:
       job:
@@ -56,7 +58,7 @@
             TEST_TEMPEST_IMAGE:
               type: string
               description: "Tempest docker image"
-              default: "docker-prod-local.artifactory.mirantis.com/mirantis/oscore/rally-tempest"
+              default: "${_param:mcp_docker_registry}/mirantis/oscore/rally-tempest"
             TEST_TEMPEST_TARGET:
               type: string
               description: "Node to run tests"