add support auth-allow configure

If you want to allow some request and not validate them, you just want to set the pattern, now you can set this. such as :
&lt;init-param>
	&nbsp;&nbsp;&lt;param-name>auth-allow&lt;/param-name>
	&nbsp;&nbsp;&lt;param-value>/login/sso&lt;/param-value>
&lt;/init-param>
The value support wildcard pattern: **/login/*.