Minor fixes to help integration of CORD-912

Change-Id: I8dd69bf2eae091ca60bbbfbfebce465405662a58
diff --git a/roles/xos-core-build/defaults/main.yml b/roles/xos-core-build/defaults/main.yml
index 2772a14..1114d07 100644
--- a/roles/xos-core-build/defaults/main.yml
+++ b/roles/xos-core-build/defaults/main.yml
@@ -4,7 +4,7 @@
 build_cord_dir: "{{ playbook_dir ~ '/../..' }}"
 build_docker_tag: "candidate"
 
-deploy_docker_registry: "localhost:5000"
+deploy_docker_registry: ""
 deploy_docker_tag: "candidate"
 
 xos_libraries: