Windows: FileInfo too small INFO_LENGTH_MISMATCH

The FileAllInformation query is initially processed by the IO Manager
and when the IO Manager is passed a buffer that is too small to hold
the File Information structure it returns STATUS_INFO_LENGTH_MISMATCH.
Previously the afs redirector returned STATUS_BUFFER_TOO_SMALL in this
case.  Instead follow IO Manager's lead.

Change-Id: I74d1b68d37fb9e79cae79408eac1f5dc4dd05e1e
Reviewed-on: http://gerrit.openafs.org/11487
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>