uuidd.rc: drop on-demand mode from script

The on-demand mode was dropped from libuuid in
commit ea4f8845f0241c7 "libuuid: don't exec uuidd"

You now need systemd (socket activation) to use
uuidd on demand.

Signed-off-by: Andreas Henriksson <andreas@fatal.se>
uuidd.rc: Requires remote_fs

The Debian package checking tool lintian thinks that the script is
missing Requires on $remote_fs because it pokes at stuff under /usr
and it's probably right.

Signed-off-by: Andreas Henriksson <andreas@fatal.se>