Bug#2160: dpkg conffile upgrades
dpkg will orphan conffiles which were previously part of a package but aren't
For example: mount-2.5-4 no longer lists /etc/fstab.sample as a conffile (in
fact `conffiles' was removed altogether) yet dpkg leaves this file behind
Can this be considered a bug in dpkg, or is the new package really responsible
for cleaning up the previous version's conffiles (say, via preinst)?