registry mirror: stop-first while updating (#1123)

this service uses host port. New version of service cannot start while
old is running since `host-mode port already in use…`

* #984

Author: YuryHrytsuk

services/registry/docker-compose.yml.j2

@@ -109,7 +109,7 @@ services:
     deploy:
       mode: global
       update_config:
-        order: start-first
+        order: stop-first
         delay: 10s
         failure_action: rollback
         parallelism: 1