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

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

test-tool/test_testunitready_simple.c

@@ -30,7 +30,7 @@ test_testunitready_simple(void)
 
 	logging(LOG_VERBOSE, LOG_BLANK_LINE);
 	logging(LOG_VERBOSE, "Test TESTUNITREADY");
-	ret = testunitready(iscsic, tgt_lun,
+	ret = testunitready(sd->iscsi_ctx, sd->iscsi_lun,
 			    EXPECT_STATUS_GOOD);
 	CU_ASSERT_EQUAL(ret, 0);
 }