Tests that setup SSLConfigs can leave conf-files lingering unless they are cleaned up via KeyStoreTestUtil.cleanupSSLConfig call. Some tests are missing this call.
If the cleanup method is not called explicitly, a modified ssl-client.xml is left in test-classes, affecting subsequent test cases. E.g. TestWebHdfsTimeouts would randomly fail, because the expected configuration fails to initialize and the default one with 60 second timeout was used.