Add decoder for BGP EVPN routes (RFC 7432) #1233
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This change extends the BGP protocol dissector with support for decoding EVPN routes as well as the EVPN-related extended communities specified in RFC 7432. This includes route types 1 through 4, as well as the MAC mobility, ESI label, ES import route target, and default gateway extended communities. Additionally I've extended the next hop attribute decoder to support IPv4 routes with IPv6 next hops, as specified in RFC 5549, as I discovered this was missing while working on my EVPN lab setup.
I've also taken some packet captures from the lab and added them as test cases for the EVPN decoder in the test suite.