Switch to modular daemons

Daniel P. Berrangérequested to merge
berrange/centos-src-libvirt:c9s-mod-daemons into c9s

Switch to use modular daemons by default.

The spec changes in this series will need to be appied to the dist-git spec file directly rather than as patches.

NB, should not be merged until redhat/centos-stream/rpms/centos-release!8 (merged) is merged

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