maint_allowlist not exempt from rate-limit

[joaooliveirap]

According to your docs

Following users are exempt from blocking:
IPs defined in var/.maintenance.ip (See Maintenance Mode guide for more details)

var/.maintenance.ip updates acl maint_allowlist but this acl is never used to exempt the ips from getting blocked.
As a result rate limit will return 429 also for IPs that are on the maintenance list.

Open PR #555

[vvuksan]

Included in 1.2.186