Ticket #47645 reset stack, op fields to NULL - clean up stacks at shutdown - free unused plugin config entries
https://fedorahosted.org/389/ticket/47645
Reviewed by: nhosoi (Thanks!)
Branch: 389-ds-base-1.3.2
Fix Description: description
Platforms tested: RHEL6 x86_64
Flag Day: no
Doc impact: no
(cherry picked from commit c5e9bd7acc8b3fef57ee040b43217e9ba04410e7)