mbs: update package command to not use items

Signed-off-by: Aurélien Bompard <aurelien@bompard.org>

roles/mbs/common/tasks/main.yml

@@ -2,12 +2,13 @@
 # Common configuration for the Module Build Service (MBS) pieces
 
 - name: install needed packages
-  package: name={{ item }} state=present
-  with_items:
-  - module-build-service
-  - python-psycopg2
-  - libsemanage-python
-  - python-memcached
+  package:
+    state: present
+    name:
+    - module-build-service
+    - python-psycopg2
+    - libsemanage-python
+    - python-memcached
   notify:
   - restart apache
   - restart fedmsg-hub