ipdb-compat: bridge support, step#1
ipdb: ancient platform support in add_port()
iocore: separate mirror() and monitor() logic
ipdb: fix lookup_master() for ancient platofrms
ipdb: check interface existence after RTM_NEWLINK
ipdb: guard RTM_DELLINK from KeyError

FIXME: just a postponed issue, should be investigated
ipdb: initial bonding support for ancient platforms
tests: remove IPDB from tests/utils.py
compat: get_master() routine
ipdb: cleanup device from possible masters

FIXME: a postponed issue, this code can and must be optimized
ipdb: check RTM_NEWLINK only on ancient platforms