wsgi server: fix python 2.7/3.4 compatibility

Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

Author: martinetd

prometheus_client/exposition.py

@@ -143,11 +143,9 @@ class ThreadingWSGIServer(ThreadingMixIn, WSGIServer):
     daemon_threads = True
 
 
-def _get_best_family(*address):
+def _get_best_family(address, port):
     infos = socket.getaddrinfo(
-        *address,
-        type=socket.SOCK_STREAM,
-        flags=socket.AI_PASSIVE,
+        address, port, 0, socket.SOCK_STREAM,
     )
     family, type, proto, canonname, sockaddr = next(iter(infos))
     return family, sockaddr[0]