DEFAULT_POLL_TIMEOUT_MILLIS is not read by the no-args TestEnvironment xtor #548
Description
The TestEnvironment() no-args constructor only checks the environment variables DEFAULT_TIMEOUT_MILLIS and DEFAULT_NO_SIGNALS_TIMEOUT_MILLIS. It does not check the DEFAULT_POLL_TIMEOUT_MILLIS env var which was added in #452
This can lead to the TCK taking a very long time to complete, especially if DEFAULT_TIMEOUT_MILLIS was set high.