/usr/share/debhelper/autoscripts/preinst-moveconffile is in debhelper 9.20120115ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | if [ "$1" = install ] || [ "$1" = upgrade ]; then
if [ -e "#OLD#" ]; then
if [ "`md5sum \"#OLD#\" | sed -e \"s/ .*//\"`" = \
"`dpkg-query -W -f='${Conffiles}' #PACKAGE# | sed -n -e \"\\\\' #OLD# '{s/ obsolete$//;s/.* //p}\"`" ]
then
rm -f "#OLD#"
fi
fi
fi
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