Shib logout should return to identity provider login page
This is reported by NYU. Right now, the logout button doesn't actually log the person out--if they haven't closed their browser and return to the DMPTool, they will still be authenticated. They have to close their browser to be logged out. This is a known problem with Shib, but if the user were returned to the IdP login page, NYU (and perhaps other institutions) perform some scripts to kill the session.