Tomcat8 Support

NonStickySessionsIntegrationTC8Test.testSessionCreatedForContainerProtectedResourceIsStoredInMemcached() is the last failing test.

It is caused by `o.a.c.a.FormAuthenticator.authenticate(Request, HttpServletResponse)` that returns a `408` / `HttpServletResponse.SC_REQUEST_TIMEOUT` because `session` is `null` and `landingPage` is `null`.