Update tests to use websockets

Change-Id: I409311b5b029b255b20e08188de3f4535c36c132
Delete uneeded files

Change-Id: If619c3084ca6b187eee77aa6b7c004b400063bd3
Use a library for common testing files

Change-Id: I732bad30229e7f487fdd4dbbe93e6c431969e542
websocket: Print proper error when listen fails

Change-Id: I3828bf21b48016089e38e9c40386966e45691e37
Fail test if mediaserver cannot be started

Change-Id: I44211326339f28ddfac0e9727f7d91e5cd5da404