Implemented the bluetooth disconnect method

Signed-off-by: Sateesh Kavuri <sateesh.kavuri@gmail.com>
Implemented the rfcomm socket opening functionality for bluetooth

The server plugin should operate in bluetooth server mode and as per the
assigned channel for bluetooth SyncML server (26), an rfcomm bluetooth
is created.

Signed-off-by: Sateesh Kavuri <sateesh.kavuri@gmail.com>