Make Agent Register request asynchronous #961
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The "Register" agent->controller method call could get stuck when the IP address configured as ControllerHost does not exist. This timeout of about 2 seconds could completely occupy the event loop and would not allow other calls on the DBus API of the Agent.
Making the "Register" method call asynchronous we allow the event loop to stay unoccupied and be able to accept SwitchController request.
Resolves: #950