stopTestPeerToPeerCallQuality()
Interrupts an in-progress testPeerToPeerCallQuality() test. The original Promise resolves immediately with whatever data has been collected so far. Also emits test-completed.
If called before data gathering has started, the result is 'aborted' with an empty data object. If data has been gathered, the result reflects the collected stats up to that point.
Return value
Returnsvoid.