Set websocket transport as default in kurento-client tests

KMS has now websockets as its default transport. New Kurento 5 apps use
ws in the client as the only transport option.

Change-Id: I98b525a6b7f9cca53b011d65d9de41e761ccaa32
Change kms.autostart to false until updating KMS starting to v5

Change-Id: Iaf1e69b6dabe14bd52d6b1bb4366162a9755c155