Update rtpAnalyze matlab tool to handle reordered packets

With this change, the tool will find and mark reordered packets in the
plot. Furthermore, the instantaneous send bitrate will be correct even
for reordered packets.

BUG=webrtc:2692
R=tina.legrand@webrtc.org

Review URL: https://codereview.webrtc.org/1172533004.

Cr-Commit-Position: refs/heads/master@{#9443}
1 file changed