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

mojo/python/tests/system_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 random
 import time
 
 import mojo_unittest
 
 # pylint: disable=E0611
-from mojo import system
+import mojo_system as system
 
 DATA_SIZE = 1024
 
 
 def _GetRandomBuffer(size):
   random.seed(size)
   return bytearray(''.join(chr(random.randint(0, 255)) for i in xrange(size)))
 
 
 class CoreTest(mojo_unittest.MojoTestCase):
@@ skipping 301 matching lines @@
     self.assertEquals(system.RESULT_OK, res1)
     self.assertEquals(system.RESULT_OK, res2)
     self.assertEquals(DATA_SIZE, len(buf1.buffer))
     self.assertEquals(DATA_SIZE, len(buf2.buffer))
     self.assertEquals(buf1.buffer, buf2.buffer)
 
     buf1.buffer[:] = data
     self.assertEquals(data, buf1.buffer)
     self.assertEquals(data, buf2.buffer)
     self.assertEquals(buf1.buffer, buf2.buffer)