Break out BWE test models to separate files

BUG=
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36299004

Cr-Commit-Position: refs/heads/master@{#8471}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8471 4adac7df-926f-26a2-2b94-8c16560cd09d
9 files changed