table graceful_exit_segment_transfer_queue will be used to replace graceful_exit_transfer_queue. Currently, it uses the path of a segment to keep track of pieces to be transferred. As we want to use the segment metainfo loop, we will need to record stream_id and position of the segment instead of relying on object path.
This change also add a uses_segment_transfer_queue column to the graceful_exit_progress table to be able to know if a transfer has been initiated while using the old table.
Change-Id: Iafb1e8e65ba124e20de4a9ff76da181c3222de7e
