Ticket #48226 - In MMR, double free coould occur under some special condition
Bug description:
In a replicated topology, a authenticated user that have write access
on an entry can send a series of operations that crash the server.
The crash is due to an access to a already freed buffer.
Fix description:
To avoid the double free, duplicate a CSNSet and assign it to the
Slapi_Value.
https://fedorahosted.org/389/ticket/48226
Reviewed by rmeggins@redhat.com (Thank you, Rich!!)