roles/drupal-vhost/vars/main.yml - add some drupal site-install option

These set the timezone/locale
roles/mysqldb - use a 'state' varname instead of enable/remove

This also sidesteps the Ansible quirk in which booleans are
stringified:

    https://github.com/ansible/ansible/issues/4194
roles/apache-vhost - use a 'state' varname instead of enable/remove

This also sidesteps the Ansible quirk in which booleans are
stringified:

    https://github.com/ansible/ansible/issues/4194
roles/apache-mod - use a 'state' varname instead of enable/remove

This also sidesteps the Ansible quirk in which booleans are
stringified:

    https://github.com/ansible/ansible/issues/4194
roles/drupal-vhost - use a 'state' varname instead of enable/remove

This also sidesteps the Ansible quirk in which booleans are
stringified:

    https://github.com/ansible/ansible/issues/4194

I believe a couple of bugs were fixed along the way, including
installing/removing the correct makefile template.
drupal.yml - remove mysqldb role invocation, adjust comments and names
drupal.yml - add in 'state' parameter.