Windows: Freelance whole volume rdr invalidate

When updating the Freelance directory do not notify the redirector
of individual objects to invalidate since that can leaad to race
conditions.  Send whole volume invalidations since that is what is
required in any case.

Change-Id: I22a963907ebbb3da3178750670a2897603463cfe
Reviewed-on: http://gerrit.openafs.org/11400
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>