Integrated relay controllers into ACTS

Added support for using relay controllers to interact with devices
used for testing. A device can be defined as a RelayDevice to work
nicely with the relay controllers without the test writer making low
level calls to switching on and off the relays. Different
RelayControllers can also be defined to allow different hardware
solutions ot be used to interact with the devices.

Bug: 36794752
Change-Id: I8fb095417e2d8da03dcfaf52b430d13f1d3aa74e
Fixes: 36794752
Test: acts/framework/tests/acts_relay_device_test.py
Test: ./RelayDeviceSampleTest -c <local config>
diff --git a/acts/__init__.py b/acts/__init__.py
new file mode 100644
index 0000000..9eb92df
--- /dev/null
+++ b/acts/__init__.py
@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+#
+#   Copyright 2016 - 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.