XXX caddy-frontend: Fix host matching in Haproxy

By using regular expressions, matching exact host names up to the optional
port and putting wildcard matches in the end, the Haproxy acl rules will allow
to direct request to correct backend.

XXX: Think about a good test.
1 job for fix/caddy-frontend-host-haproxy-clash in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-luke/fix/caddy-frontend-host-haproxy-clash

08:46:57