Confusing detached/attached events due to driver workaround

[danbim]

Due to a workaround done some time ago (itm/wsn-device-drivers#148) TelosB devices are disconnected and reconnected after each flash operation. As the detach / attach events are communicated to the user and displayed in the GUI users are confused.

See https://github.com/itm/testbed-runtime/blob/develop/iwsn-gateway/src/main/java/de/uniluebeck/itm/tr/iwsn/gateway/SingleDeviceAdapter.java#L460.

[danbim]

See #370