Restore ansible role

Change-Id: I0363ef4dc3446d13a48791c3bb401831143de1f1
(cherry picked from commit 799d493a8611efd5ab9dd3578a620874dea480c1)
diff --git a/roles/head-node/meta/main.yml b/roles/head-node/meta/main.yml
index 7d1c04d..97b4caa 100644
--- a/roles/head-node/meta/main.yml
+++ b/roles/head-node/meta/main.yml
@@ -13,3 +13,4 @@
     - cord
 dependencies:
   - { role : maas }
+  - { role : ansible }