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

mojo/tools/mopy/print_process_error.py

Index: mojo/tools/mopy/print_process_error.py
diff --git a/mojo/tools/mopy/print_process_error.py b/mojo/tools/mopy/print_process_error.py
deleted file mode 100644
index ec565d14e40c02ab618b7ffd79269bfad4ab35d3..0000000000000000000000000000000000000000
--- a/mojo/tools/mopy/print_process_error.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# 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.
-
-def print_process_error(command_line, error):
-  """Properly format an exception raised from a failed command execution."""
-
-  if command_line:
-    print 'Failed command: %r' % command_line
-  else:
-    print 'Failed command:'
-  print 72 * '-'
-
-  if hasattr(error, 'returncode'):
-    print '  with exit code %d' % error.returncode
-    print 72 * '-'
-
-  if hasattr(error, 'output'):
-    print error.output
-  else:
-    print error
-  print 72 * '-'