LU-212 reject connection with bad ocd_brw_size

LU-212 reject connection with bad ocd_brw_size

in obdfilter, rejecting connection request with -EPROTO if OBD_CONNECT_BRW_SIZE
is set in obd_connect_data->ocd_connect_flags, but "ocd_brw_size" in it is zero.

Change-Id: Iba002250a11ab7321dbb5d4f398dde5ebd00c11d
Signed-off-by: Hongchao Zhang <hongchao.zhang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/431
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Reviewed-by: Oleg Drokin <green@whamcloud.com>