Supersedes and closes #4256.
Auth: output current message on bind-reload-now
Also log the result of the parsing in the server
Add d_wasRejectedLastRelaod bool to BindDomainInfo
Before, we used d_loaded to show "[rejected]" in the `pdns_control
bind-reload-now` output. However, an already loaded zone that was
rejected later, it would not show "[rejected], it would not show
auth: Keep the existing bind backend zone if reload fails