bootstrapping: only web should depend on forms

This fixes the problem that CLI scripts or other applications without
an application directory would badly fail because of missing web forms.

refs #6411

library/Icinga/Application/ApplicationBootstrap.php

@@ -301,7 +301,6 @@ abstract class ApplicationBootstrap
 
         $this->loader = new Loader();
         $this->loader->registerNamespace('Icinga', $this->libDir. '/Icinga');
-        $this->loader->registerNamespace('Icinga\\Form', $this->appDir. '/forms');
         $this->loader->register();
 
         return $this;

library/Icinga/Application/Web.php

@@ -124,6 +124,7 @@ class Web extends ApplicationBootstrap
             ->setupInternationalization()
             ->setupRequest()
             ->setupZendMvc()
+			->setupFormNamespace()
             ->setupModuleManager()
             ->loadEnabledModules()
             ->setupRoute()
@@ -359,5 +360,19 @@ class Web extends ApplicationBootstrap
         }
         return $this;
     }
+
+    /**
+     * Setup an autoloader namespace for Icinga\Form
+     *
+     * @return  self
+     */
+    private function setupFormNamespace()
+    {
+        $this->getLoader()->registerNamespace(
+            'Icinga\\Form',
+            $this->getApplicationDir('forms')
+        );
+        return $this;
+    }
 }
 // @codeCoverageIgnoreEnd