(ITS#6606) syncrepl search reply for post-dated cookie

[mbackes@symas.com]

Full_Name: Matthew Backes
Version: RE24
OS: 
URL: 
Submission from: (NULL) (76.88.107.46)


When replicas try to connect to their provider and supply a cookie generated
from a CSN beyond what the provider has, the provider returns success and does
nothing.  It'd be better to return unwilling-to-perform and squirt out an error
indicating that the cookie is in the future.

This can happen when the replica is actively receiving changes from the current
ppolicy setup or other bug-like situations.