Change tls client auth related options
Change tls client auth related options

This change is a feedback from a chrome network member.
See also, https://chromiumcodereview.appspot.com/10541168/

BUG=none
TEST=none

Review URL: https://codereview.appspot.com/6344112

git-svn-id: a751b5b3dcfba0ee4592a85c40d2fdd063ca0d53@654 4ff78f4a-9131-11de-b045-6380ec9940d4

XiaonuoGantan/pywebsocket,XiaonuoGantan/pywebsocket