We had a long blip between Xena and now where we didn't changed the libvirt
versions. Now it's time to modify the documentation for it.
Change-Id: Ida10f12d7dd950e470ba06d0f38c3dd6ac7f8876
TODO: We should also modify the supported distro versions.
This change moves the LibvirtDistroSupportMatrix [1] wiki page into the
tree as a reference doc. The wiki page will be decommissioned once this
change lands and is published.
Some older distro information is removed to keep the table readable and
a note is added to driver.py to ensure it updated with each version
bump.
[1] https://wiki.openstack.org/wiki/LibvirtDistroSupportMatrix
Change-Id: Id49a4e400159130fbc676800aeca6b9746071a2e
elajkat