TESTS: move the default url, lun and iscsi context into a structure

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

test-tool/test_readcapacity16_alloclen.c

@@ -35,7 +35,7 @@ test_readcapacity16_alloclen(void)
 	logging(LOG_VERBOSE, "Test that READCAPACITY16 with alloc_len 0-15 is not an error");
 
 	for (i = 0; i < 16; i++) {
-		ret = readcapacity16(iscsic, tgt_lun, i,
+		ret = readcapacity16(sd->iscsi_ctx, sd->iscsi_lun, i,
 				     EXPECT_STATUS_GOOD);
 		if (ret == -2) {
 			logging(LOG_NORMAL, "[SKIPPED] READCAPACITY16 is not implemented on this target and it does not claim SBC-3 support.");