Bug#983737: open-iscsi: configuration does not finish with sysvinit-core

[Ansgar]

That looks like the same issue as #589487 and others.

Either make sure the sysvinit script cleans up the environment to make
it is safe to be run, have the daemon do so to be safe to be started
via sysvinit scripts, or add a workaround to the postinst script (fixes
this particular problem, but not if the sysvinit script gets called in
some other environment).

Ansgar