Log the local Bluetooth address.

components/net/sf/briar/plugins/bluetooth/BluetoothPlugin.java

@@ -60,6 +60,9 @@ class BluetoothPlugin extends AbstractPlugin implements StreamPlugin {
 			synchronized(this) {
 				super.start();
 				localDevice = LocalDevice.getLocalDevice();
+				if(LOG.isLoggable(Level.INFO))
+					LOG.info("Local address " +
+							localDevice.getBluetoothAddress());
 			}
 		} catch(UnsatisfiedLinkError e) {
 			// On Linux the user may need to install libbluetooth-dev