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.

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>
(cherry picked from commit de7af90fb8a1a132fb44fcc3d732fb593a45f6db)

Change-Id: I76cd2738df31b1609d0065ac2706a86f75d8a269
Reviewed-on: http://gerrit.openafs.org/3857
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>