Parameterize value `enabled` for cloudwatch-api

Reason: Heat CloudWatch API has been removed from
openstack Queens and above.
Stacklight team have fired Alert about heat cloudwatch but
its a false positive since in recent heat this cloudwatch
is not longer present.

Change-Id: Id540c386f87279d4601b13510b4a548e0f20721f
Related-Prod: PROD-25742 (PROD:25742)
(cherry picked from commit 50676628308afb545d180b5c237b9e9540a0ea85)
diff --git a/defaults/init.yml b/defaults/init.yml
index dec31b6..3ce4818 100644
--- a/defaults/init.yml
+++ b/defaults/init.yml
@@ -43,3 +43,8 @@
     # Make sure this global variable is defined everywhere, where used it is already set on cluster level
     cluster_public_host: '127.0.0.1'
     single_address: '127.0.0.1'
+    # Stub parameter, to render target local_registry_mirror_image_list
+    local_docker_client_registry_target_registry: "apt:5000"
+    # Cloudwatch api removed from Queens
+    openstack_heat_cloudwatch_api_enabled: True
+