Rtorrent: DHT does not respect changes in network.bind_address

[mvn23]

When changing network.bind_address.set at runtime, the listening socket is updated with the new address. However, dht still uses the old address, even after stopping and starting dht with dht.mode.set.

Steps to reproduce:

• Start rtorrent with dht enabled
• Check the listening socket used for dht (likely :::6881)
• Change the bind address, e.g. network.bind_address.set=192.168.0.3
• (Optional, has no effect) restart dht dht.mode.set=off; dht.mode.set=on
• Check the listening socket again

Expected result:
DHT should use the new address for the listening socket, i.e. 192.168.0.3:6881

Actual result:
DHT is still using the old address, i.e. :::6881

When binding to :::6881 this isn't a huge issue, but if you start rtorrent with a different network.bind_address and change it afterwards it breaks dht if the old address is no longer used.

[rakshasa]

The feature-bind branch aims at dealing with all these issues, which is going to take a while as I'm redoing a lot of the networking code.

I've once again actively working on this project, and donations would be appreciated.