[Pdbg] [PATCH 5/5] tests: Log stderr output (if any) on test failure

[Alistair Popple]

> If the test is not trying to match any output on stderr, then the
> output on stderr is currently ignored.

Fair point actually. Guess we don't really need progress bars in our log files 
:-)
 
> This patch was added because a test was failing, but I could not figure
> out why.  The error message was on stderr and was ignored.  That's why
> I decided to log the $output_stderr_raw.
> 
> I can make it stricter by only logging when the test has failed
> (mismatched rc or mismatched output_stdout).
> 
> Amitay.