Merge "RTSP: correctly discard stale access unit after seeking." into nyc-dev am: 505abca79e
am: 9f82b7319e

* commit '9f82b7319ef9282cc7d2db3eb999556d4db0b910':

Change-Id: I8268c0118b1f87a91ad4f27f2f5ff9f07a7ae1e7