MT#65368 fix UI /logout link

* when /logout is used on the old UI, it no longer
  produces ERROR: Couldn't render template "logout/logout_index.tt"

Change-Id: I94f29c8a400da509ca26ddf2f410ddc76edec55f
(cherry picked from commit f21064a2d4)

lib/NGCP/Panel/Controller/Logout.pm

@@ -23,8 +23,10 @@ Catalyst Controller.
 
 =cut
 
-sub logout_index :Path {
+sub auto :Private {
     my ($self, $c) = @_;
+
+    return 1;
 }
 
 sub logout :Chained('/') :PathPart('logout') :Args(0) {