Fix binding to link-local IPv6 addresses
Fix binding to link-local IPv6 addresses

Fixes #465.

We must specify the interface to bind to with % for libuv.

blaurent49/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter