Much lighter update this time around, as expected.

Changes:

+ As of coreutils-8.32-11.fc33 the 'cp' command defaults to reflink=auto, instead of reflink=never; this is consistent with upstream master. This isn't exclusively a Btrfs change, XFS benefits as well. https://src.fedoraproject.org/rpms/coreutils/c/5d08d14b https://bugzilla.redhat.com/show_bug.cgi?id=1861108

+ libvirt 6.6.0 storage pool code now attempts to disable COW by default on btrfs; it can be disable (previously reported as patches having landed, now it's merged) https://www.redhat.com/archives/libvir-list/2020-August/msg00032.html