Removed unused exceptions. Also disabled output for ant tests.

api/net/sf/briar/api/transport/InvalidConfigException.java

...et/sf/briar/api/transport/InvalidPropertiesException.java

api/net/sf/briar/api/transport/TransportPlugin.java

...et/sf/briar/api/transport/batch/BatchTransportPlugin.java

.../sf/briar/api/transport/stream/StreamTransportPlugin.java

components/net/sf/briar/plugins/AbstractPlugin.java

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

components/net/sf/briar/plugins/file/FilePlugin.java

...nents/net/sf/briar/plugins/file/RemovableDrivePlugin.java

components/net/sf/briar/plugins/socket/SocketPlugin.java

test/build.xml