Add flags to python test server for channel id, extended master secret, and token binding

BUG=467312

Committed: https://crrev.com/22e67634e17914c5dddc6ad2649a4bf701908311
Cr-Commit-Position: refs/heads/master@{#349164}

Review URL: https://codereview.chromium.org/1347503002

Cr-Original-Commit-Position: refs/heads/master@{#349736}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 661ba7af493eee0eb89e4b7e4c8817edb20093f9
1 file changed