Add the configuration parameters to give users the option to turn on/off...

... auto-fix feature.

This pull request will add 3 additional azkaban configs:
project.validators.fix.prompt controls whether to show the auto-fix related UI
project.validators.fix.lable controls the content of the auto-fix label
project.validators.fix.link sets the link which contains the detailed information about the auto-fix feature.
Can you use the jQuery ui-icon-help or ui-icon-info icon instead of an ordinary question mark?
See http://api.jqueryui.com/theming/icons/
Azkaban already includes a bunch of UI icons in https://github.com/azkaban/azkaban/tree/master/azkaban-webserver/src/web/css/images