Implemented matching for ND protocol related ICMPv6 messages (#257)
Implemented matching for ND protocol related ICMPv6 messages (#257)

- ROUTER_SOLICIT -> ROUTER_ADVERTIST
- NEIGHBOUR_SOLICIT -> NEIGHBOUR_ADVERTIST

Check if code equals zero according to https://tools.ietf.org/html/rfc4861#page-39
UlfWetzker/libtins,UlfWetzker/libtins,mfontanini/libtins,mfontanini/libtins