Ticket #48748 - Fix memory_leaks test suite teardown failure
Bug Description: TearDown part of memory_leaks/range_search_test.py
goes with error. Because of that valgrind_disable(sbin_dir) is
never executed. It causes all next setup-ds.pl commands fail.
Fix Description: Change topology.standalone object to just standalone.
Otherwise, it is not found.
Reviewed by: mreynolds (Thanks!)
(cherry picked from commit 797786d5329ebb13527fbaa7410b1f0901d28bb3)