Install libvirt-python on hypervisor
Install libvirt-python on hypervisor

Libvirt-python is required to run virt ansible module [1].

[1] http://docs.ansible.com/ansible/latest/modules/virt_module.html#requirements

RHOSINFRA-1815

Change-Id: I8837ee0a07e5877655002d25ccc2357d4148c20c

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared