[TASK] Extend topology database to store neighbor's interface and MAC address

[mariomaz]

When processing Topology Discovery message we must store the IEEE 1905.1 AL MAC address of the transmitting device together with the MAC address of the interface on which the message is transmitted and the interface on which such message is received. Currently we are storing AL MAC address only.

These fields are required to, for example, process Link Metric Query (#1427) and Topology Query messages (#1428) properly.
Modify transport to include which interface the message was received on.