Adding new registry_port option (#5779)

New override are added to allow installation of the registry
on different ports than ``5000``. The default port is unchanged
from previous versions

roles/kubernetes-apps/registry/templates/registry-svc.yml.j2

@@ -14,5 +14,5 @@ spec:
     k8s-app: registry
   ports:
     - name: registry
-      port: 5000
+      port: {{ registry_port }}
       protocol: TCP