Add test for LogrotateContainerLogger's FD management.
Add test for LogrotateContainerLogger's FD management.

Adds a test which checks for erroneous calls to `os::close` by the
LogrotateContainerLogger.  This may happen by accident if the
container logger module uses `Subprocess::PIPE` when launching child
processes; as libprocess will track these FDs and close them (possibly
even if they've already been closed) when the child processes exit.

Review: https://reviews.apache.org/r/42880/

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