[mux] Fix expectation of MuxTest.test_parse_request_text
[mux] Fix expectation of MuxTest.test_parse_request_text

len(header) should be 2.

Review URL: https://codereview.appspot.com/6585064

git-svn-id: a751b5b3dcfba0ee4592a85c40d2fdd063ca0d53@678 4ff78f4a-9131-11de-b045-6380ec9940d4

XiaonuoGantan/pywebsocket,XiaonuoGantan/pywebsocket