create new file website_logonoff_check.py

1.访问登录页面，把用户名和密码POST上去
2.查看返回的登录页面h1的内容是不是My Account,是的话成功
3.访问登出页面，查看返回的登出页面h1的内容是不是My Account,否的话成功
4.退出
# python website_logonoff_check.py  -w 10 -c 20
OK: Performed Logon/logoff operation sucessfully in 8.593946 seconds