CentOS Stream is Rolling-release distro that tracks just ahead of
Red Hat Enterprise Linux (RHEL) development [1]. While not recommended
in RDO, it's used to find potential issues before they are found in
official CentOS 8.
CentOS Stream is reported by facter as '8' with no minor version,
breaking the logic to discover the libvirtd version. This patch is
setting the version of libvirtd to 5.6 for all CdentOS 8 releases,
including Stream, as 8.0 is no longer supported.
[1] https://www.centos.org/centos-stream/
Change-Id: I468ecf06ac6e0853fbb296c011f20d63e38f6922
b6294ce7a2