Update acceptance tests to use real duration of YouTube video.
Merge pull request #3318 from edx/valera/l62a

Update acceptance tests to use real duration of YouTube video.
HD control is hidden initially. On first play of video, when
player.getAvailableQualityLevels returns a non-empty array, it will eventually display, if HD qualities are available (highres, hd1080, hd720). [BLD-937]