So I bumped into this
fatal: [77.55.234.30]: FAILED! => {"changed": false, "msg": "The MySQL-python module is required."}

So I added it to my MySQL role
- name: Install mysql
  apt: name={{ item }} state=present
  with_items:
    - mysql-server
    - MySQL-python

failed: [77.55.234.30] (item=[u'mysql-server', u'MySQL-python']) => {"changed": false, "item": ["mysql-server", "MySQL-python"], "msg": "No package matching 'MySQL-python' is available"}

So I guess MySQL-python is not available in the default repo?