Unexpected timeout results if no Stdout being returned

[frankisawesome]

As title suggests - if let's say the exec command goes into a infinite loop, the test execution will hang past the configured timeout and not output any Stdout or Stderr upon exiting.

If the maintainers agree this is a problem I can draft up a PR to optionally allow Stderr/Stdout be streamed to system stderr/stdout during execution for debugging 👍

[pablochacin]

@frankisawesome thanks for reporting this issue. Helping debugging such situations would be useful.