Test runner: remove noisy debug output.

tools/test-server.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 60 matching lines @@
   # Create directory for trusted public keys of peers (and self).
   trusted_dir = os.path.join(ROOT, "trusted")
   if not os.path.exists(trusted_dir):
     os.makedirs(trusted_dir)
 
   # Install UltraJSON. It is much faster than Python's builtin json.
   try:
     import ujson  #@UnusedImport
   except ImportError:
     # Install pip if it doesn't exist.
-    code = subprocess.call("which pip", shell=True)
+    code = subprocess.call("which pip > /dev/null", shell=True)
     if code != 0:
-      apt_get_code = subprocess.call("which apt-get", shell=True)
+      apt_get_code = subprocess.call("which apt-get > /dev/null", shell=True)
       if apt_get_code == 0:
         print("Installing pip...")
         _Cmd("sudo apt-get install python-pip")
       else:
         print("Please install pip on your machine. You can get it at: "
               "http://www.pip-installer.org/en/latest/installing.html "
               "or via your distro's package manager.")
         sys.exit(1)
     print("Using pip to install UltraJSON...")
     _Cmd("sudo pip install ujson")
@@ skipping 112 matching lines @@
       print("Added certificate %s to trusted certificates." % response)
     else:
       print("Unknown command")
       _PrintUsage()
       sys.exit(2)
   else:
     print("Unknown command")
     _PrintUsage()
     sys.exit(2)
   sys.exit(0)