Make tcp testing api use bytes not words.
Make tcp testing api use bytes not words.

Don't prematurely delete connections.

BUG=None
TEST=None
R=binji@chromium.org

Review URL: https://codereview.chromium.org/1063803002

yeyus/naclports,yeyus/naclports,yeyus/naclports,yeyus/naclports,yeyus/naclports,yeyus/naclports