[PATCH i-g-t v5] runner: Parse results harder

[Krzysztof Karas]

Hi Kamil,

> Sometimes an error happens in kernel or in test that leaves
> output files in corrupted or incorrect state. While runner or
> resume will just move on to executing next test, when generating
> results it could end up with no results.json
> 
>   Try processing outputs a little more persistently and use any
> output file left there, even if only dmesg.txt. Also, when no
> useful output files were present, instead of breaking out add
> notrun.
> 
>   Inform about processing results for each test so a problem
> could be spotted more easily.
> 
> v2: removed ')' from 'notrun\n)' (Kamil)
>  using bool var, added more prints about errors (Ryszard)
> v3: reused open_for_reading, removed bool var (Krzysztof)
>  closing only positive fds[] in close_outputs(), checking
>  file sizes also if all opens succeeded (Kamil)
> v4: reverting to v2 and addresing review comments (Krzysztof)
>  closing only already opened file, drop early return when empty
>  output files as this changes run status (Kamil)
> v5: reverting to returning false after any out/err/dmesg output
>  is missing, simplified later checks and printed logs, fixed
>  closing outputs (Kamil)
> 
Reviewed-by: Krzysztof Karas <krzysztof.karas at intel.com>

Best Regards,
Krzysztof