Let OS select an available port when running TestInstalledAppFlow #407
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tests.unit.test_flow.TestInstalledAppFlow attempts to create a new server at the specified host:port. New server creation occasionally results in 'address already in use' because the socket will be unavailable for a period of time after the socket is closed, resulting in flaky test failures.
Work around this in the tests by letting the OS pick an available port each time.
Fixes #381