mock_kms.js needs to call clearRawMongoProgramOutput() before checking rawMongoProgramOutput() for certain strings. Today, the test does not clear the log and this can cause the mock.js to erroneously believe the mock server has started when it is used multiple times in a single test.

There are other mocks that share the same issue
jstests/free_mon/libs/free_mon.js
jstests/noPassthrough/libs/configExpand/lib.js