CORD-382 updated compute node provisioning so that the specification of fabric NIC identification is passed on

Change-Id: Ibf596d610f5420f9a9ead7ce3a6f93d022ad85ac
(cherry picked from commit 2e76f122660da12e5fdad5d58be52d9d4fe871c3)
diff --git a/roles/head-node/files/compute-node-vars.yml b/roles/head-node/files/compute-node-vars.yml
new file mode 100644
index 0000000..4991bbb
--- /dev/null
+++ b/roles/head-node/files/compute-node-vars.yml
@@ -0,0 +1 @@
+fabric_iface_spec: '{{ compute_node.fabric_iface_match }}'