Ticket 47613 - Issues setting allowed mechanisms
Bug Description: Adding an empty value for nsslapd-allowed-sasl-mechanisms blocks all
sasl authentication. Also changing the allowed sasl mechansism does
require a restart after making a change.
Fix Description: Reject an empty values for nsslapd-allowed-sasl-mechanisms, and allow
config changes to occur without restarting the server.
https://fedorahosted.org/389/ticket/47613
Reviewed by: nhosoi(Thanks!)
(cherry picked from commit 43959232f792db2b79e614f6db78f7569920fdc1)