Fix default _params

Change-Id: Iee5601f9b85de932db5774cb5e9af767130fd127
diff --git a/init.yml b/init.yml
index 7f18fd4..01eaa92 100644
--- a/init.yml
+++ b/init.yml
@@ -131,7 +131,7 @@
         - docker-ce
         - python-docker
       insecure_registries:
-        - apt:5000
+        - ${_param:default_local_mirrror_content:docker_client_registry_target_registry}
       options:
         bip: 10.99.0.1/16
         fixed-cidr: 10.99.0.1/17