add support for running ansible on the head node to provision the compute node

Change-Id: I4adda3e903423e68893d2354d6c9c36469ebb517
diff --git a/roles/head-node/files/compute-node.yml b/roles/head-node/files/compute-node.yml
new file mode 100644
index 0000000..7fb41f0
--- /dev/null
+++ b/roles/head-node/files/compute-node.yml
@@ -0,0 +1,4 @@
+- hosts: all
+  remote_user: ubuntu
+  roles:
+    - compute-node