p-m: use timeout to prevent master from getting stuck

It is possible that the master gets stuck waiting for a response from
the slave or while fetching a Packages file - this is usually related
to network errors.
Terminate the master instance after 15 minutes to prevent a section
from being locked forever, requiring manual interaction to cleanup.

Signed-off-by: Andreas Beckmann <anbe@debian.org>
new bug template: postinst_uses_usr_share_doc

Signed-off-by: Andreas Beckmann <anbe@debian.org>
use rm --one-file-system for a bit more safety

mount may not work reliably if symlinks are involved ...

Signed-off-by: Andreas Beckmann <anbe@debian.org>
ia32-libs exceptions for --enable-recommends

Signed-off-by: Andreas Beckmann <anbe@debian.org>
p: do not run adequate on possibly removed packages

Signed-off-by: Andreas Beckmann <anbe@debian.org>
p: be explicit about running scripts

Signed-off-by: Andreas Beckmann <anbe@debian.org>