Support for broadcoms multifunctional devices

bnc#841170, fate#316090

and cleanup and so on.
That's a big blob of test fixtures. 12 NICs. I am looking at how to make it more useful. Perhaps we can deduplicate it, selecting only representative ones.
The data should have a comment describing how we made it (presumably copied from logs in bnc#...), and what is interesting about it (the storageonly attribute I guess).
See also my approach, for a simpler case: https://github.com/yast/yast-network/blob/599d2b98025c0c83432cd289296d7d148dbdc367/test/network_autoconfiguration_test.rb#L11