support nunc-stans for basic accept and read events
    
    NOTE: shutdown is not working.  You will have to kill -9 ns-slapd
    in order to shut it down.
    To build:
    First, checkout and build liblfds.
    Next, checkout and build nunc-stans.
    Next, checkout a branch of 389 and apply this patch.
    Next, configure ds with the following arguments:
    --enable-nunc-stans --with-lfds=/path/to/liblfds --with-nunc-stans=/path/to/nunc-stans
    Make and install ds.
    Edit the ds etc/sysconfig/dirsrv - add export LD_LIBRARY_PATH=/path/to/liblfds/bin:/path/to/nunc-stans
    Run setup-ds
    Edit etc/sysconfig/dirsrv-instance - add export LD_LIBRARY_PATH=/path/to/liblfds/bin:/path/to/nunc-stans
    might be ~/.dirsrv/dirsrv-instance instead