Create LXD containers instead of VMs

Change-Id: I66580af317419285278d59e59d290e90f3d0dd29
diff --git a/cord-head-playbook.yml b/cord-head-playbook.yml
index b60b1fd..84c30c3 100644
--- a/cord-head-playbook.yml
+++ b/cord-head-playbook.yml
@@ -40,6 +40,7 @@
   roles:
     - { role: head-prep, become: yes }
     - { role: config-virt, become: yes }
+    - create-lxd
     - create-vms
 
 - name: Create docker images