note: uid/gid breakage in F21 Atomic
The latest tree update changed the gid for sshkeys (among other things). It needs a
backport of some rpm-ostree fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=1203006
Which are waiting on karma here:
https://admin.fedoraproject.org/updates/rpm-ostree-2015.3-1.fc21