Windows: Check for RO and Open Target in rename

During a file rename operation, check to see if the target file
has the DOS readonly attribute set or has a non-zero reference
count.  If yes, the request must be failed.  The error status
depends upon the state of the pending delete flag.  Either
STATUS_PENDING_DELETE or STATUS_ACCESS_DENIED.

Change-Id: I90fa1ea54176f96ca3052ee2b774b1179642e2ef
Reviewed-on: http://gerrit.openafs.org/11506
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>