Windows: Protect against infinite VIO retries

Keep track of the number of VIO errors reported by the file servers.
If the count exceeds 100, abandon the request.

Change-Id: I4d18ccca732802752c94c9ca1b36ca9a827c72de
Reviewed-on: http://gerrit.openafs.org/9923
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>