Bug#324695: openssh-server should conflict against ssh < 4.1

[Max Kellermann <max@duempel.org>]

Package: openssh-server
Version: 1:4.1p1-6

Try the following on a sarge system, sid in sources.list:

 apt-get install openssh-server

... which will not upgrade or remove "ssh".  Now deinstall "ssh"
manually:

 dpkg -r ssh

ssh's prerm script will now stop the ssh server, although it was
started by openssh-server.  This creates an inconsistent state,
because the administrator has to manually start the ssh service after
the upgrade.

Simple solution: openssh-server and openssh-client should conflict
against ssh < 4.1, either forcing "ssh" to be upgraded to the
transitional package, or (even better) forcing "ssh" to be removed.