Delete empty mojo python package, and prefix all python packages with mojo_

mojo/python/tests/messaging_unittest.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import unittest
 
 import mojo_unittest
-from mojo.bindings import messaging
+from mojo_bindings import messaging
 
 # pylint: disable=E0611
-from mojo import system
+import mojo_system as system
 
 
 class _ForwardingConnectionErrorHandler(messaging.ConnectionErrorHandler):
 
   def __init__(self, callback):
     messaging.ConnectionErrorHandler.__init__(self)
     self._callback = callback
 
   def OnError(self, result):
     self._callback(result)
@@ skipping 186 matching lines @@
     self.assertNotEquals(message_header.request_id, 0)
     response_header_data = messaging.MessageHeader(
         0,
         messaging.MESSAGE_IS_RESPONSE_FLAG,
         message_header.request_id).Serialize()
     self.handle.WriteMessage(response_header_data)
     self.loop.RunUntilIdle()
     self.assertFalse(self.received_errors)
     self.assertEquals(len(back_messages), 1)
     self.assertEquals(back_messages[0].data, response_header_data)