`caddy:set`, `haproxy:set`, and `traefik:set` previously accepted per-app writes for properties that only have a single host-wide reader, so `:set myapp image foo:bar` printed a success message while `:report myapp` kept showing the global default. The per-app form is now rejected with `The key '<key>' can only be set globally`, matching the existing rejection used for haproxy `refresh-conf` and traefik `challenge-mode`. Caddy `tls-internal` remains the only legitimate per-app property in this family.
The byjg/easy-haproxy image polls Docker for label changes every 10
seconds by default, which races with the haproxy bats suite and
intermittently produces curl exit 7. Expose `refresh-conf` as a
global-only haproxy property that maps to `EASYHAPROXY_REFRESH_CONF`,
lower it to 2 seconds in the bats setup, and wrap the localhost HTTP
assertions in a retry loop so checks wait for haproxy to converge
rather than failing on the first attempt.
