in libvirt driver support
This is split 3 of 3 for the architecture emulation feature.
Added initial ci content for tempest test.
Implements: blueprint pick-guest-arch-based-on-host-arch-in-libvirt-driver
Signed-off-by: Jonathan Race <jrace@augusta.edu>
Change-Id: I0159baa99ccf1e76040c197becf2a56c3d69d026