Ticket 47427 - Overflow in nsslapd-disk-monitoring-threshold
Bug Description: If you directory try and set the threshold to -2,
the server allows it, but it should be rejected.
Fix Description: With PR_snprintf and other NSPR formatting functions,
%lld must be used with LONG_MAX, instead of %ld which
must be used with regular printf.
https://fedorahosted.org/389/ticket/47427
Reviewed by: mreynolds (Thanks!)
(cherry picked from commit 5df006bd765163279f14cfbb0a136c15c69bed5b)