[kurento-jsonrpc] Change webSocket client for JsonRpcClientWebSocket and
cleanup

Change-Id: I806085cd0d90d642879486f164d8ff541f0169cf
[kurento-client-test] Format FaceOverlayFilterTest

Change-Id: Ibe01e24cca06cadde77e303acbeed2daa0f17ad1
[kurento-control-server] Remove unused dependencies and update tests

Change-Id: I6f18d0a89fb0e877bd2c45548682b042c90f003b