Windows: Replicated requires more than one site

Windows: Replicated requires more than one site

The VLDB response may include a list of servers some of which
are not valid replicas because the DONOTUSE flag is set or
because the replica site may be out of date.  Instead of setting
the replication state based upon the server count in the VLDB
response, use the number of RO sites that were deemed valid
at the end of processing.

Change-Id: I47780e1633f3148f1f7c76af89224cbe37dde6c6
Reviewed-on: http://gerrit.openafs.org/7639
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>