xmp => when creating a new port, set of_port_num to 0, adjusted to changes in port_manager API
xmp plugin => catch all exceptions from xdpd
Merge branch 'devel-0.4' into akoepsel/devel-0.5/working
Merge branch 'akoepsel/devel-0.5/testing' into akoepsel/devel-0.5/pbb
Merge branch 'akoepsel/devel-0.5/pbb' of https://github.com/bisdn/xdpd into akoepsel/devel-0.5/pbb