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

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

test-tool/test_readcapacity10_simple.c

@@ -34,7 +34,7 @@ test_readcapacity10_simple(void)
 	logging(LOG_VERBOSE, LOG_BLANK_LINE);
 	logging(LOG_VERBOSE, "Test basic READCAPACITY10");
 
-	ret = readcapacity10(iscsic, tgt_lun, 0, 0,
+	ret = readcapacity10(sd->iscsi_ctx, sd->iscsi_lun, 0, 0,
 			     EXPECT_STATUS_GOOD);
 	CU_ASSERT_EQUAL(ret, 0);
 }