Install nova-placement package on upgrade
Install nova-placement package on upgrade

This doesn't exist in newton images, so install it via the
ansible tasks during step3 (when all other packages are updated).

Change-Id: I08fb7855b910ccc5a8ab2d73f1de15b695784abd
Closes-Bug: #1664265

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates