change python-libguestfs to python-guestfs for ubuntu
change python-libguestfs to python-guestfs for ubuntu

python-libguestfs is for centos,
python-guestfs is for ubuntu.

Related-Bug: #1742029

Change-Id: Ia1578dfcc9e4dbf32d29773f07424bbfe9328951

stackforge/kolla,stackforge/kolla,openstack/kolla,rahulunair/kolla,openstack/kolla,stackforge/kolla,rahulunair/kolla