We weren't explicitly closing the PackWriter, and __del__ no longer
does either. Make PackWriter a "new style" object so that the super()
call will also work with python 2.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Reviewed-by: Rob Browning <rlb@defaultvalue.org>
[rlb@defaultvalue.org: split from larger commit; adjust commit message]
[rlb@defaultvalue.org: convert PackWriter to "new style" object] Signed-off-by: Rob Browning <rlb@defaultvalue.org> Tested-by: Rob Browning <rlb@defaultvalue.org>