Support for server hostname

[anadelonbrin]

Migrated from Sourceforge tracker #2499950.

The pyzor client should also support a hostname instead of an IP address
when using "pyzor discover" (downloaded from
http://pyzor.sourceforge.net/cgi-bin/inform-servers-0-3-x).

DNS round-robin can then be used to support multiple servers. It also makes
it much easier to move the public server to a new IP.

[anadelonbrin]

Looking at the code, it seems like this would work already. The server is
passed to socket.socket.sentto, which accepts normal socket.AF_INET
addresses, which can be hostnames or IP addresses.

Have you verified that this does not in fact already work?

[anadelonbrin]

I have not actually checked if this already works. Will do.

[anadelonbrin]

Hostname indeed seems to work fine. I have changed the default Pyzor server
from 82.94.255.100:24441 to public.pyzor.org:24441 (which resolves to that
same IP). If anyone has a better hostname suggestion then do let me know.