http: add a (disabled) test for TLS handshake timeouts
http: add a (disabled) test for TLS handshake timeouts

It's currently broken and disabled, pending a fix
for Issue 2281.

R=golang-dev, adg
CC=golang-dev
http://codereview.appspot.com/5092045

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go