RedirectController into auto config as default and null pointer fix. (#621)

* Vaadin patch and redirect controller to auto config.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fix potential null pointer.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* revert Vaadin update.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Conditional on missing bean.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fix on permission checks.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fix permission checks.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fix nested cascade on delete.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

hawkbit-runtime/hawkbit-update-server/src/main/java/org/eclipse/hawkbit/app/RedirectController.java

@@ -1,30 +0,0 @@
-/**
- * Copyright (c) 2015 Bosch Software Innovations GmbH and others.
- *
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- */
-package org.eclipse.hawkbit.app;
-
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.servlet.ModelAndView;
-
-/**
- * Redirects for convenience of the example apps users. hawkBit's management UI
- * is by default not listening on / but on /UI.
- *
- */
-@Controller
-public class RedirectController {
-
-    /**
-     * @return redirect to the Management UI
-     */
-    @RequestMapping("/")
-    public ModelAndView home() {
-        return new ModelAndView("redirect:/UI/");
-    }
-}