[miniFakeDns] Embiggen logging upon DNS responses

Log the address and port of the requesting client when minifakedns
sends back a response.

BUG=None
TEST=suite_Smoke

Change-Id: I983c25f9bf7fea59162c9bba99976b2348bc8c5d
Reviewed-on: http://gerrit.chromium.org/gerrit/8016
Commit-Ready: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Elly Jones <ellyjones@chromium.org>
diff --git a/src/miniFakeDns.py b/src/miniFakeDns.py
index 04c08e5..834e05e 100755
--- a/src/miniFakeDns.py
+++ b/src/miniFakeDns.py
@@ -83,7 +83,9 @@
         data, addr = self._udps.recvfrom(1500)
         p=DNSQuery(data)
         self._udps.sendto(p.respuesta(self._fake_ip), addr)
-        logging.debug('Response: %s -> %s' % (p.dominio, self._fake_ip))
+        logging.debug('Response to %s: %s -> %s' % (addr,
+                                                    p.dominio,
+                                                    self._fake_ip))
       except socket.timeout:
         pass