mod_authz_internal: Make host considered the parent configurable This bestows the role specified by the 'host_user_role' setting onto users of that host. For simplicity, only a single host can be specified. Making it configurable allows for setups where VirtualHost and related Components may be siblings instead of having a subdomain relationship. For setups with many VirtualHosts sharing a single Component, the 'server_user_role' setting is more appropriate. Even more complicated setups would have to resort to mod_firewall or similar.