Ticket 47853 - client hangs in add if memberof fails
Bug Description: If memberof plugin is enabled and the client adds an
entry with a membership attr it hangs if the memberof_postop_add
rejects the operation.
Fix Description: The problem is due to an unexpected error code being set
in the pblock (-1). Setting the proper LDAP error code
resolves the hang.
https://fedorahosted.org/389/ticket/47853
Reviewed by: lkrispenz(Thanks!)