[PATCH 00/11] Add PPP server support

[Zhenhua Zhang]

The patches extend GAtPPP to support PPP server role, so that you use gsmdial or wvdial to talk to test-server (Patch 6/11 adds PPP server support in test-server).

If you're interesting to try it, connect two machines by BlueZ serial proxy.

Server side:
1. Run ./test-server by 'root'. It will tell you the server port.
2. Update /etc/bluetooth/servial.conf. Create one if it doesn't exist.

	[Proxy DUN] # UUID for DUN proxy service
	UUID=00001103-0000-1000-8000-00805F9B34FB
	# Address for device node
	Address=/dev/pts/xxx

3. Restart bluetoothd.

Client side:
1. rfcomm bind -r <server bdaddr> 1
2. Run './gsmdial -n /dev/rfcomm0' by 'root'. 

You may update client's /etc/resolve.conf with server DNS info.