updated to allow deployment to be driven by a configuration file
diff --git a/roles/head-node/vars/main.yml b/roles/head-node/vars/main.yml
new file mode 100644
index 0000000..e97daf1
--- /dev/null
+++ b/roles/head-node/vars/main.yml
@@ -0,0 +1,9 @@
+provision:
+ # CHANGE:
+ # 'location' git URL from which to clone a repository that contains the role
+ # definitions to be used then provisioning a compute node
+ # 'role_path' directory path within the repo that contains the roles.
+ # 'role' name of the role to provision for new compute nodes
+ location: "{{ prov_location | default('http://gerrit.opencord.org/maas') }}"
+ role_path: "{{ prov_role_path | default('roles') }}"
+ role: "{{ prov_role | default('compute-node') }}"