Surpress unimportant log messages on servo_test.

- Disable the ping messages, like:
11:19:12 INFO | PING 10.0.0.39 (10.0.0.39) 56(84) bytes of data.
11:19:12 INFO | From 10.0.0.1 icmp_seq=1 Destination Host Unreachable
11:19:12 INFO |
11:19:12 INFO | --- 10.0.0.39 ping statistics ---
11:19:12 INFO | 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms
11:19:12 INFO |

- Disable the SSH connection warning, like:
11:16:53 ERROR| [stderr] Warning: Permanently added '10.0.0.39' (RSA) to the list of known hosts.

- Disable the XML RPC server logging, like:
11:16:44 ERROR| localhost - - [10/Nov/2011 19:10:16] "POST /RPC2 HTTP/1.0" 200 -

BUG=chromium-os:22598
TEST=run_remote_tests.sh --remote=$REMOTE_IP -a "xml_config=$OVERLAY_XML \
        servo_vid=0x18d1 servo_pid=0x5001" firmware_TryFwB

Change-Id: I65d904775e66769e7a0a869539fb2a53bc85215d
Reviewed-on: https://gerrit.chromium.org/gerrit/11585
Reviewed-by: Todd Broch <tbroch@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
diff --git a/client/cros/faft_client.py b/client/cros/faft_client.py
index 3ffb477..c329388 100644
--- a/client/cros/faft_client.py
+++ b/client/cros/faft_client.py
@@ -214,7 +214,8 @@
     faft_client = FAFTClient()
 
     # Launch the XMLRPC server to provide FAFTClient commands.
-    server = SimpleXMLRPCServer(('localhost', options.port), allow_none=True)
+    server = SimpleXMLRPCServer(('localhost', options.port), allow_none=True,
+                                logRequests=False)
     server.register_introspection_functions()
     server.register_instance(faft_client)
     print 'XMLRPC Server: Serving FAFTClient on port %s' % options.port