(ITS#9016) cn=config should fail on EMIT if target directory not empty

Full_Name: Ondrej Kuznik Version: re24/master OS: URL: Submission from: (NULL) (82.10.24.68)

Running slapd/slaptest to convert a slapd.conf to cn=config will happily reuse the target directory.

However if there was some existing configuration present already, slaptest reports a successful conversion, even though the resulting directory most likely won't represent the slapd.conf used - existing .ldif files won't be replaced or removed. Depending on the differences between slapd.conf and slapd.d in place, the result might not even be a useable cn=config anymore.

Since it's not feasible to clean up properly, it should just return an error instead?