Add support for multiple interfaces

The extension currently uses the first broadcast address returned to it to make a NBNS request. We should loop through all available broadcast addresses.

Locate the code that receives broadcast addresses and currently selects the first one for the NBNS request. Read how available interfaces and broadcast addresses are represented, then verify that a request is made for every available broadcast address. Done means all returned broadcast addresses are handled rather than only the first.

Written by the indexing model from the issue text.