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

mojo/python/tests/mojo_unittest.py

Index: mojo/python/tests/mojo_unittest.py
diff --git a/mojo/python/tests/mojo_unittest.py b/mojo/python/tests/mojo_unittest.py
index f80ffacf1972d1496fa049b0d20d7dcbc1095655..fc921ac03083085cb7a56b3e050cb379a63a1d71 100644
--- a/mojo/python/tests/mojo_unittest.py
+++ b/mojo/python/tests/mojo_unittest.py
@@ -5,8 +5,8 @@
 import unittest
 
 # pylint: disable=E0611,F0401
-import mojo.embedder
-import mojo.system
+import mojo_embedder
+import mojo_system
 
 
 class MojoTestCase(unittest.TestCase):
@@ -16,9 +16,9 @@ class MojoTestCase(unittest.TestCase):
 
   def run(self, *args, **kwargs):
     try:
-      mojo.embedder.Init()
-      self.loop = mojo.system.RunLoop()
+      mojo_embedder.Init()
+      self.loop = mojo_system.RunLoop()
       unittest.TestCase.run(self, *args, **kwargs)
     finally:
       self.loop = None
-      assert mojo.embedder.ShutdownForTest()
+      assert mojo_embedder.ShutdownForTest()