This makes the dnsdist start-up script/service file check the config before attempting to start. The initscript will refuse to stop the servic eon a restart if the config is broken.
dnsdist: document --check-config in --help
dnsdist: Ignore file created by autoreconf
dnsdist: check config before starting
dnsdist: Add #4764 and #4765 to the beta2 ChangeLog