Add a simple handler cookie_wsh.py useful for cookie test
Add a simple handler cookie_wsh.py useful for cookie test

Release note: Add a simple handler cookie_wsh.py useful for cookie test

Review URL: https://codereview.appspot.com/79430043
googlearchive/pywebsocket,google/pywebsocket,google/pywebsocket,GoogleChromeLabs/pywebsocket3,google/pywebsocket,googlearchive/pywebsocket,GoogleChromeLabs/pywebsocket3,GoogleChromeLabs/pywebsocket3,googlearchive/pywebsocket