Bug#458138: nss_ldap upgrade overwrites conf file without question

[Peter Molnar]

Package: nss_ldap
Version: 251-7.5etch1

On upgrade from libnss-ldap 251-7.5 -> 251-7.5etch1, debconf
overwrites the old version of the config file, thus breaking a
previously working system. I suggest it should work like all the other
debconf scripts, i.e. asking whether the installed version should stay
on the system, or to install the package maintainer's version.

I am using Debian GNU/Linux Etch