Add wrapper module

This takes the wrapper importing code from main.py and moves it into
its own module so that other modules may import it without causing
circular imports with main.py.

Change-Id: I9402950573933ed6f14ce0bfb600f74f32727705

wrapper.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+import imp
+import os
+
+
+def WrapperPath():
+  return os.path.join(os.path.dirname(__file__), 'repo')
+
+_wrapper_module = None
+def Wrapper():
+  global _wrapper_module
+  if not _wrapper_module:
+    _wrapper_module = imp.load_source('wrapper', WrapperPath())
+  return _wrapper_module