Fix wget healthchecks to not use localhost

For a reason, current wget versions error out when using localhost instead
of 127.0.0.1 as the healthcheck for docker services. Probably has something
to do with dns resolution - either on docker or wget end, but have not
looked to deep into it.

roles/nextcloud/templates/docker-stack.yml.j2

@@ -7,7 +7,7 @@ services:
       - backend
       - "{{ docker_swarm_public_network_name }}"
     healthcheck:
-      test: ["CMD", "wget", "--quiet", "--spider", "--tries=1", "http://localhost:2019/metrics"]
+      test: ["CMD", "wget", "--quiet", "--spider", "--tries=1", "http://127.0.0.1:2019/metrics"]
       interval: 1m
       timeout: 10s
       retries: 3