the include_tasks is the new feature in version 2.4[0], and
kolla use it[1], the ansible_version_min should be updated
to version 2.4

[0]: https://docs.ansible.com/ansible/2.4/include_tasks_module.html
[1]: https://review.openstack.org/#/c/584728/

Change-Id: I273ac9e8295bfe3fb97af620c1e48e9fbbf06c6e