Move the apptest runner and parts of mopy to the public SDK.

mojo/tools/mojo_demo.py

Index: mojo/tools/mojo_demo.py
diff --git a/mojo/tools/mojo_demo.py b/mojo/tools/mojo_demo.py
index 0726e2efa2fb99d5c639585c4fa42a25a0a61aa5..f43b7c043e9c185ca07caa4ed2ab2bcbf0133600 100755
--- a/mojo/tools/mojo_demo.py
+++ b/mojo/tools/mojo_demo.py
@@ -3,14 +3,16 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from mopy.config import Config
 import argparse
-import mopy.paths
 import os
 import pipes
 import subprocess
 import sys
 
+import add_sdk_tools_to_path
+from mopy.config import Config
+import mopy.paths
+
 # FIXME: We need to merge the mojo/tools and sky/tools directories
 sys.path.append(os.path.join(mopy.paths.Paths().src_root, 'sky', 'tools'))
 from skypy.skyserver import SkyServer