Use client IP in logs, not host

This is the more common behaviour, and it is also more reliable as
it may require some time to look up hostnames and they may change
over time.

websockify/websockifyserver.py

@@ -99,7 +99,7 @@ def __init__(self, req, addr, server):
         SimpleHTTPRequestHandler.__init__(self, req, addr, server)
 
     def log_message(self, format, *args):
-        self.logger.info("%s - - [%s] %s" % (self.address_string(), self.log_date_time_string(), format % args))
+        self.logger.info("%s - - [%s] %s" % (self.client_address[0], self.log_date_time_string(), format % args))
 
     #
     # WebSocketRequestHandler logging/output functions