modify: desconnect before login, and  retry login 3 times when  login
failed.
modify: wifi state change event action.
modify: add relogin function!
Merge branch 'master' of git@github.com:wangyq/AuthBuptGw.git

Conflicts:
	AuthBuptGw/res/values/strings.xml
modify: login logic
fix: add another login action when login failed!