p/tag-stats: Fix use of uninitialized variable

Signed-off-by: Niels Thykier <niels@thykier.net>
c/init.d: Add missing "use L::Util qw(...)"

Signed-off-by: Niels Thykier <niels@thykier.net>
L::Unpacker: Try to rename the child processes

If supported, have Perl rename the collecting processes that uses the
the "perl-coll" call interface.  This makes easier to see what is
happening in (e.g.) top or via ps.  For platforms, where the process
cannot be renamed, these processes will still be named "lintian" like
their parent.

Signed-off-by: Niels Thykier <niels@thykier.net>