Update min_ansible_version to 1.9
Update min_ansible_version to 1.9

This role makes use of the ternary filter which was only introduced in
Ansible 1.9, this patch updates the min_ansible_version to 1.9.

Change-Id: I9615fe04b5f3772e41087ae9142276dd8e442ab1

openstack/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server