Add sysvinit-utmp-utils package

Add a binary package that ships last, lastb and utmpdump binaries to replace those lost from util-linux. last is installed as last.wtmp to avoid clashing with the wtmpdb package.

This package will benefit anyone wishing to interrogate old wtmp and other utmp-formatted logs from old tools after migrating to wtmpdb.

I think there might be some demand for such tooling although the versions from util-linux of course benefited from being road tested in Debian over a long period.

I am not remotely wedded to the binary package name - please do override it!

Originally raised in relation to #1094921 but that bug has been satisfied by adding an initscript to wtmpdb and in any case this never would have been the solution for most people, just helpful extra tooling.