Quote variables in 'with_items' loop

[pitervergara]

Hi!

Thanks for the playbook! Ansible noob here...
I had to do a little change to run it on my Ansible version (Detail below)

root@dbf512391c80:/etc/ansible# ansible-playbook --version
ansible-playbook 2.4.2.0
  config file = None
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.12 (default, Nov 20 2017, 18:23:56) [GCC 5.4.0 20160609]