Adds PowerVM support for the VIRT_DRIVER conf

Change-Id: I95d0f1417bd29196da281e8d76ecbdb1d407851f
Install polkit on Fedora/openSUSE when using nova

We clearly depend on polkit. It's usually already installed, but for
people using JeOS images, it's not.

Change-Id: Ieccd0ff569f7d4541833b98232aeebb36b3493cb
Merge "Install polkit on Fedora/openSUSE when using nova"
Merge "Adds PowerVM support for the VIRT_DRIVER conf"