Currently on every distro we build against the latest git libvirt
and related deps. We need to test multiple axis:
- A variety of libvirt versions
- A variety of distro versions
So this changes most jobs to build against the distro provided
libvirt and related deps. The CentOS 8 job is kept building
against latest git master libvirt and deps.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>