Don't use local config for Docker registry login

It doesn't work when deploying in Vagrant :(

roles/docker/tasks/services/docker_registry.yml

@@ -28,9 +28,8 @@
   args:
     creates: "{{ docker_registry.volume_folder }}/auth/htpasswd"
 
-- name: log in to local registry
+- name: log in to registry
   docker_login:
     registry: "{{ docker_registry.domain }}"
     username: "docker"
     password: "{{ docker_password }}"
-    config_path: "{{ docker_registry.volume_folder }}/auth/config.json"