move admin-openrc.sh copy from docker-compose to new role xos-config

Change-Id: I9d3b0d01485d19e756b6d9b339373fbc9874dc15
diff --git a/cord-head-playbook.yml b/cord-head-playbook.yml
index 7e8c221..a39ff7a 100644
--- a/cord-head-playbook.yml
+++ b/cord-head-playbook.yml
@@ -68,6 +68,7 @@
   hosts: head
   roles:
     - docker-compose
+    - xos-config
     - xos-head-start
 
 - name: Set up Automated Compute Node Provisioning