Update the code involving change notification listeners to ensure that they are
invoked just before the response is sent to the client rather than just after
the response.  This can help avoid race conditions in which the server needs to
use a change notification listener to perform some additional processing for a
given operation, and the client sends a second request that depends on this
processing immediately after receiving a "success" response for the operation
that triggered the change notification.

OpenDS Issue Number: 1200