test__dns.py: remove unused import

--HG--
extra : transplant_source : %02%FF%A1Yr%EB%B7t%0C%BA%DC%E8d%E6%3C%26R%F4%15o

greentest/test__dns.py

@@ -2,7 +2,6 @@
 import greentest
 from gevent import dns
 from gevent import core
-from gevent import socket
 from gevent.dns import DNSError
 
 funcs = [dns.resolve_ipv4, dns.resolve_ipv6,