moving pkgs to defaults for edxlocal

playbooks/roles/edxlocal/defaults/main.yml

+---
+edxlocal_debian_pkgs:
+  - pymongo
+  - python-mysqldb
+  - mysql-server-5.5
+  - postfix 

playbooks/roles/edxlocal/tasks/main.yml

@@ -11,14 +11,8 @@
 #  http://downloads.mysql.com/archives/mysql-5.1/mysql-5.1.62.tar.gz
 #
 ---
-- name: edxlocal | install python-pymongo (req for ansible)
-  pip: name=pymongo
-
-- name: edxlocal | install python-mysqldb (req for ansible)
-  apt: pkg=python-mysqldb state=present
-
-- name: edxlocal | install mysql server and recommends
-  apt: pkg=mysql-server-5.5 state=present install_recommends=yes
+- name: edxlocal| install packages needed for single server 
+  apt: pkg={{','.join(edxlocal_debian_pkgs)}} install_recommends=yes state=present
 
 - name: edxlocal | create a database for edxapp
   mysql_db: >