test-tool: Add overwrite check for all test cases

Check if the residual data does not owerwrite existing data blocks has now
been added for all testing data to improve the uniformity of test runs,
increase test readability and remove the duplicate testing data records.

include/iscsi-private.h

@@ -40,6 +40,9 @@ extern "C" {
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 #endif
+#ifndef DIV_ROUND_UP
+#define DIV_ROUND_UP(x, y) (((x) + (y) - 1) / (y))
+#endif
 
 #define ISCSI_RAW_HEADER_SIZE			48
 #define ISCSI_DIGEST_SIZE			 4