[389-devel] Please review: Introducing an environment variable USE_VALGRIND to clean up the entry cache and dn cache on exit.

Description: If any string is set to an environment variable USE_VALGRIND, when running a memory leak checking tool (e.g., valgrind), it reduces the noise generated by the entry cache and dn cache. Sample valgrind outputs from the same operations. 1. with USE_VALGRIND ==16525== LEAK SUMMARY: ==16525== definitely lost: 5,102 bytes in 155 blocks ==16525== indirectly lost: 24,655 bytes in 950 blocks ==16525== possibly lost: *13,294* bytes in 433 blocks ==16525== still reachable: 2,209,801 bytes in 17,937 blocks ==16525== suppressed: 0 bytes in 0 blocks ==16525== Reachable blocks (those to which a pointer was found) are not shown. ==16525== To see them, rerun with: --leak-check=full --show-reachable=yes 2. no USE_VALGRIND ==25738== LEAK SUMMARY: ==25738== definitely lost: 5,102 bytes in 155 blocks ==25738== indirectly lost: 24,655 bytes in 950 blocks ==25738== possibly lost: *23,862,444* bytes in 863,885 blocks ==25738== still reachable: 3,093,988 bytes in 41,603 blocks ==25738== suppressed: 0 bytes in 0 blocks ==25738== Reachable blocks (those to which a pointer was found) are not shown. ==25738== To see them, rerun with: --leak-check=full --show-reachable=yes Thanks, --noriko