Add support for the nfsv4 user ID mapping daemon, configured with
a sensible default, and add a packageconfig for Kerberos support.
This is reasonably tested in production in our environment, but only
systemd support. There'll be some more work to do to get GSSAPI and
NFS idmapd support integreated into that.
Signed-off-by: Daniel McGregor <daniel.mcgregor@vecima.com>