Windows: Adjust error return values

Windows: Adjust error return values

Do not return STATUS_TIMEOUT to the smb redirector, doing so
results in an undesireable disconnect.

Map RXKADNOAUTH to STATUS_CLOCK_SKEW as that is the most
frequent cause of rx level authorization failures.

Map CM_ERROR_UNKNOWN to access denied since there is no
better error choice.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/661
Reviewed-by: Asanka Herath <asanka@secure-endpoints.com>
Tested-by: Asanka Herath <asanka@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>