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

mojo/python/tests/async_wait_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 mojo_unittest
 
 # pylint: disable=E0611
-from mojo import system
+import mojo_system as system
 
 
 class AsyncWaitTest(mojo_unittest.MojoTestCase):
 
   def setUp(self):
     super(AsyncWaitTest, self).setUp()
     self.array = []
     self.handles = system.MessagePipe()
     self.cancel = self.handles.handle0.AsyncWait(system.HANDLE_SIGNAL_READABLE,
                                                  system.DEADLINE_INDEFINITE,
@@ skipping 22 matching lines @@
 
   def testAsyncWaitCancel(self):
     self.loop.PostDelayedTask(self.cancel, 0)
     self._PostWriteAndRun()
     self.assertEquals(len(self.array), 0)
 
   def testAsyncWaitImmediateCancel(self):
     self.cancel()
     self._PostWriteAndRun()
     self.assertEquals(len(self.array), 0)