Ticket 47427 - Overflow in nsslapd-disk-monitoring-threshold
Bug Description: The threshold setting was being stored as an "int" instead
of a PRUint64. Config setting validation was also incomplete.
Fix Description: Changed the data type to PRUint64 from int, and improved the config
validation, and logging.
https://fedorahosted.org/389/ticket/47427
Reviewed by: richm & nhosoi(Thanks!!)
(cherry picked from commit 6a0ed40b25a6dd4aaf3774a70199e8842499b42d)