CORD-391 - cleaned up ansible to pass cleanly through ansible-lint

Change-Id: I90284704255edc19abbdb239852c520a4bf48df4
diff --git a/roles/head-node/files/compute-node.yml b/roles/head-node/files/compute-node.yml
index ba2bd24..b8eb496 100644
--- a/roles/head-node/files/compute-node.yml
+++ b/roles/head-node/files/compute-node.yml
@@ -3,7 +3,8 @@
   hosts: all
   remote_user: ubuntu
   tasks:
-  - include_vars: vars/compute-node.yml
+  - name: Include variables
+    include_vars: vars/compute-node.yml
 
 - name: Configure compute hosts to use DNS server
   hosts: all