Merge branch 'master' of github.com:bigbluebutton/bigbluebutton into captions-text-tracks-intermediate-branch

Merge branch 'captions-text-tracks-intermediate-branch' of github.com:bigbluebutton/bigbluebutton into captions-text-tracks-intermediate-branch

 - put captions into temporary file to remove race condition between start of processing and writing contents of file.

RaP: Fix error message when shared notes could not be archived.

It used to print:

Failed to download file: undefined local variable or method `respose' for BigBlueButton:Module
Did you mean?  response

because the incorrect variable name was used in the error message.

There was no effect other than the message in the log, since the shared notes
couldn't be archived anyways, and the only thing the exception did was ...
prevent the shared notes from being archived.

Try to improve Kurento listen-only error reporting

Align the checkbox and the label (guest management)

Fix the warning that appears when user enters as guest

Bump audio leave log level

 - log upload captions params

Pass callback for closing of permissions-overlay

WebdriverIO Tests

It now attempts to convert the uploaded caption file to WebVTT and
updates the index file.

Some additional validation/normalization is added for the language tag,
and some cleanup has been done for logging.

Makes testing easier

FFmpeg has pretty good format autodetection even if the filename has the
'.txt' extension, so just rely on that. It'll even pull subtitles out of
video files - although I expect we'll have size limits so that doesn't
happen.

Rather than running the tool in a loop, I'm using inotify to watch for
new files being created (ideally, the other rap workers will be migrated
to this style in the future). The trigger for processing is the creation
of the .json index file for the uploaded track.