Only return stdout when running commands for integration tests #363
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When running container-diff in integration tests, both stdout and stderr were being returned
and unmarshalled into the container-diff json object. If container-diff
was giving any error messages (such as, if it didn't have permissions to
extract a file), this would fail even if ultimately no
differences between the filesystems were found.
I updated the RunCommands to only return stdout and print stderr if the
command fails.
This should fix the failing test in #360