Exclude Ansible 2.5 from driver-reqs
Exclude Ansible 2.5 from driver-reqs

Ansible 2.5 appears to be incompaible with the current
ansible driver interface. Until we've sorted it out,
we should block >=2.5.0 from being installed.

Related-Bug: #1758462

Change-Id: I9c3b2528f8da28554e3eb4e03528517a6c6c326f

openstack/ironic,openstack/ironic