[vcloud_director] wait for undeploy to finish before returning

lib/fog/vcloud_director/models/compute/vapp.rb

@@ -32,7 +32,8 @@ module Fog
         end
 
         def undeploy
-          service.undeploy(id)
+          response = service.undeploy(id)
+          service.process_task(response.body)
         end
 
       end

lib/fog/vcloud_director/requests/compute/undeploy.rb

@@ -12,6 +12,7 @@ EOF
             :body    => body,
             :expects => 202,
             :method  => 'POST',
+            :parser => Fog::ToHashDocument.new,
             :headers => {'Content-Type' => 'application/vnd.vmware.vcloud.undeployVAppParams+xml' },
             :path    => "vApp/#{vapp_id}/action/undeploy"
           )