Windows: log and invalidate invalid dir pages

Windows: log and invalidate invalid dir pages

If when parsing a directory page in cm_ApplyDir the consistency
checks fail, log a message and invalidate the page in case
it was a transient failure.

Change-Id: Iab690cd876a717fbdef30fb78e4ed559fa7e0a5a
Reviewed-on: http://gerrit.openafs.org/3742
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>