RFC 3720 is not clear about whether a target should return SUCCESS
or CHECK CONDITION if SPDTL > EDTL. Hence accept both. See also
Fred Knight, Re: [Ips] Data Out residual overflow/underflow handling,
IETF mailing list archive, 21 September 2012
(http://www.ietf.org/mail-archive/web/ips/current/msg02756.html).
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Also test that IF the iSCSI layer provides 2 blocks of DATA-OUT but
the SCSI WRITE* command only covers one single block,
then only the first block will be modified but not the second block.
