Log warning instead of error for audio output device change errors

Handle jibri errors and busy status

Do not subscribe each JitsiTrack to RTCEvents.AUDIO_OUTPUT_DEVICE_CHANGED event

Solves the issue with not reported JS errors

Reopen data channels on ice restart

Correctly subclass JingleSession

Remove repetitions

The previous method was clobbering the JingleSession prototype,
preventing the creation of additional subclasses.

Removes fake video tracks from the code

Fix JS error returned by callstats when no error is passed to be reported

Remove browser type check

Depending on the type of browser within which the library is executing,
we take the decision how many times to call getUserMedia (e.g. once for
audio and once for video on Firefox). Upon getting a result of the
call, we used to perform similar browser type checks. I see this as
repetition of logic which makes it difficult to add new browser types
(e.g. React Native). Try to examine the result of the call to
getUserMedia and thus avoid re-checkign the browser type.

Fixes issue with fake streams that are never removed

Nukes the pre-configured bridge from the example config file.

Jicofo is smart and can find any bridge with service discovery and/or
pubsub.

Changes console.* to logger.*