Bug 1254 - added basic functionality test for OFRpcTaskUtil

- removed unused method OFRpcTaskUtil#wrapBarrierErrors

Change-Id: I6ad9cfdf22f12fd00fd6d8727e8cad730d788dae
Signed-off-by: Martin Bobak <mbobak@cisco.com>
Bug 1254 - added test of basic funcionality for ErrorHandlerSimpleImpl

Change-Id: Ide8c121d0bef3807aa707eafa36a8de156fe7522
Signed-off-by: Martin Bobak <mbobak@cisco.com>