use http code (403) when registrar portal access is denied by ip whitelist, show client ip

app/controllers/registrar/sessions_controller.rb

@@ -188,7 +188,7 @@ class Registrar
     def check_ip
       return if Rails.env.development?
       return if WhiteIp.registrar_ip_white?(request.ip)
-      render text: t('access_denied') and return
+      render :denied, :layout => false, status: :forbidden, :locals => { :ip => request.ip } and return
     end
   end
 end

app/views/registrar/sessions/denied.haml

@@ -0,0 +1 @@
+#{t('access_denied')} from #{ip}