Do not focus logout menu item after a recurring login

Implement new MenuItemRenderer made for pages that are not part
of the regular site navigation and should trigger a complete site reload
instead of handling it via XHR.

library/Icinga/Web/Menu.php

@@ -248,7 +248,8 @@ class Menu implements RecursiveIterator
 
             $section->add(t('Logout'), array(
                 'url'      => 'authentication/logout',
-                'priority' => 700
+                'priority' => 700,
+                'renderer' => 'ForeignMenuItemRenderer'
             ));
         }
     }

library/Icinga/Web/Menu/ForeignMenuItemRenderer.php

@@ -0,0 +1,24 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Web\Menu;
+
+use Icinga\Web\Menu;
+use Icinga\Web\Url;
+
+/**
+ * A menu item with a link that surpasses the regular navigation link behavior
+ */
+class ForeignMenuItemRenderer implements MenuItemRenderer {
+
+    public function render(Menu $menu)
+    {
+        return sprintf(
+            '<a href="%s" target="_self">%s%s<span></span></a>',
+            $menu->getUrl() ?: '#',
+            $menu->getIcon() ? '<img src="' . Url::fromPath($menu->getIcon()) . '" class="icon" /> ' : '',
+            htmlspecialchars($menu->getTitle())
+        );
+    }
+}