Windows: Correct lock error codes and log file server lockCount

Windows: Correct lock error codes and log file server lockCount

The error codes that should be returned when a lock request
fails are:

  STATUS_LOCK_NOT_GRANTED for an explicit lock request
  STATUS_SHARING_VIOLATION when a CreateFile fails due to a previous lock

Correct the service to ensure that these values are in fact returned.

Also, add 'fsLockCount' field to cm_scache_t and dump its value
as part of the "fs memdump" output.  This permits some ability to
identify what the file server thinks the lock count is.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/646
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>