Eperez account termination

There are no side effects. The 'next_page' in the session is used if there is no 'next_page' GET param in the request.

In this case, after terminating the account, I call the logout_view from eduiddashboard.saml2.views, which makes a round trip to the IdP and ends up in the logout_service view where the lines we are talking about are. We don't get any next_page GET param from the IdP, so the one in the session (which we have set previously, in the terminate-account view where all this starts) is used.

In the normal logout view, where we have not set the next_page in the session, the  'saml2.logout_redirect_url' will be used, unless there is a next_page GET param in the request.