ASACOMP-27 - Add validation tests

ASACOMP-27 - Add validation tests for certifying 
             the Gateway Agent Manager Application

1) Added Gateway Agent Manager Application validation-tests-suites-gwagent
2) Modified dependencies to include the GatewayController.jar
3) Modified ServiceHelper.java to expose the internal BusAttachment so that
   it can be used in the derived GWAgentHelper class

Change-Id: Id524d8127e52ccaeacef9832fc6cf66308a1a52e
Signed-off-by: Eyal Ilsar <eyali@qce.qualcomm.com>