pull the xos-base container from the local registry

Change-Id: I358c0614b53385c4d9725e165a654d4e4a6f8898
diff --git a/roles/xos-vm-install/defaults/main.yml b/roles/xos-vm-install/defaults/main.yml
index 0944416..0be9d5b 100644
--- a/roles/xos-vm-install/defaults/main.yml
+++ b/roles/xos-vm-install/defaults/main.yml
@@ -8,8 +8,13 @@
 
 xos_configuration: "devel"
 
-xos_container_rebuild: True
+xos_container_rebuild: False
 
 service_profile_repo_url: "https://gerrit.opencord.org/p/service-profile.git"
 service_profile_repo_dest: "~/service-profile"
 service_profile_repo_branch: "HEAD"
+
+docker_opts: ""
+docker_tag: "latest"
+docker_registry: "docker.io"
+local_docker_registry: "docker-registry:5000"