Update support matrix to match nova
Update support matrix to match nova

Nova has made some changes to the support matrix wording, added and
removed some sections, indicated cli commands that were previously
missing, etc. This attempts to update ours to match.

Change-Id: I3853cb4e511df25a512dfe16ddd9e6abf30552fb

openstack/nova-powervm,openstack/nova-powervm,stackforge/nova-powervm,stackforge/nova-powervm