iproute: `get_bridge()`, `get_bond()` support

Bug-Url: https://github.com/svinota/pyroute2/issues/51
Bug-Url: https://github.com/svinota/pyroute2/issues/50
ipdb: integrate bridge & bond support

Bug-Url: https://github.com/svinota/pyroute2/issues/51
Bug-Url: https://github.com/svinota/pyroute2/issues/50