ECOM-6107

TNL-5245

[captions] move role attr from li element to nested span (AC-343)

[video] fix failing tests for video captions (AC-343)

[video] couple more failing tests (AC-343)

[video] properly outline the focused caption (AC-343)

Fix read only support for team discussions

Fix error messages to use "posts" not "threads"

More small UI tweaks, padding and alignment

Add a11y tests for all inline discussion states

Improve discussion error messages

Make this selector more specific, was getting overrides

Fix Teams implementation of inline discussion

Fix LMS tests

Work on pagination support

Jasmine tests for this feature

Focus works when navigating between list and detail

Fix safe template violations

Sadly, I introduce a time.sleep here. The hovering over the elements is
particularly brittle, and there is no obvious signal for when the page is
done rendering. I'm putting a sleep in here so we can more-quickly support
Firefox 45.

Also changes section to div.

TNL-6044

TNL-5891

TNL-5894

TNL-5774

TNL-1955

This reverts commit e80d9b57.

TNL-5669

This reverts commit d59ab18b, reversing
changes made to 0ebab35e.

TNL-5281

This specifically enables/disables the underlying comment service client
used to make calls to the service.  When disabled, this client will now
throw an exception which can be propagated upwards so that callers can
make the right decision about how to notify users of the error, or
handle retry, etc etc.