[SCSI] stex: Small fixes

Some small fixes, including:
- add data direction in req_msg because new firmware version
  may require this (backward compatible)
- change internal timeout value
- change judgment of type st_vsc1
- blank line handling, etc.

Signed-off-by: Ed Lin <ed.lin@promise.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>