Ticket 386 - Overconsumption of memory with large cachememsize and heavy use of ldapmodify
    
    Bug Description:  With very large entry cache setting, the memory process grows using just
                      simple ldapmodifies.
    
    Fix Description:  The growth is caused by memory fragmentation.   On Linux, we can set a
                      malloc option that impacts this fragmentation, but impacts performance.
    
    https://fedorahosted.org/389/ticket/386
    
    Reviewed by: richm(Thanks!)