I found another casualty (libvirt-daemon) and the fix:
On Tue, Aug 14, 2012 at 06:22:51PM -0400, Chuck Anderson wrote:
Forwarding here since I think this is an SELinux issue w/rpm running
%pre scripts. See the two bugs below.
The "screen" package has this %pre script:
preinstall scriptlet (using /bin/sh):
/usr/sbin/groupadd -g 84 -r -f screen