stderr output

[jeronimo-planet]

When we do an exec, we get an { ouput, exitCode }.
It would be nice if we could get a { stdout, stderr, exitCode }.
Do you guys think it's possible?

[kiview]

This is the result type in tc-java, so that would be a quite alinged implementation:

class ExecResult {
    int exitCode;
    String stdout;
    String stderr;
}

[cristianrgreco]

PR welcome. I'd suggest keeping the existing output field, and adding the stdout/stderr fields. Otherwise we lose the ability to log the output in time order. Removing the output would also be a breaking change.