Stale multicast address

[wasnotrice]

When an interface has been changed to a different network, it can use a stale multicast address, resulting in an EADDRNOTAVAIL error.

Expected: the interface uses the multicast address for the current network Actual: the interface uses the multicast address for the first network it saw

Steps to reproduce:

1. Connect to a wifi network
2. Start a dnssd browser
3. Stop the dnssd browser
4. Connect to a different wifi network
5. Start a dnssd browser

An error like this is thrown:

Error: setMulticastInterface EADDRNOTAVAIL at Socket.setMulticastInterface (dgram.js:566:11) at Socket.eval (webpack:///./node_modules/dnssd/lib/NetworkInterface.js?:238:41) at Socket.emit (events.js:182:13) at startListening (dgram.js:128:10) at state.handle.lookup (dgram.js:249:7) at process._tickCallback (internal/process/next_tick.js:63:19)