Non 0 PST for SegmentTimeline VOD will fail

Created by: dsparacio

if either video or audio PST is non 0 and SegmentTimeline static the code in playback controller to capture commonEarliestTime on bytesAppended will fail. With SegmentTimeline we already know if the PST is 0 or not. I modified handler to expose the current segment list and we check that at getStartTime.