Add support for SAP protocol features:
* connect and disconnect requests
* connect and disconnect responses
* disconnect indication
* timeouts for the valid connection
Add a Sim Access Server to the SAP plugin and a framework for the dummy
sap driver as well.
* add the server register and unregister rutines
* add server listening socket setup
* add SAP DBus API
* add prototypes for SAP protocol implementation
* add skeleton of dummy SIM driver