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-proxy-ds.yml.j2

@@ -31,8 +31,8 @@ spec:
             - name: REGISTRY_HOST
               value: registry.{{ registry_namespace }}.svc.{{ cluster_name }}
             - name: REGISTRY_PORT
-              value: "5000"
+              value: "{{ registry_port }}"
           ports:
             - name: registry
               containerPort: 80
-              hostPort: 5000
+              hostPort: {{ registry_port }}