[PATCH] [test-suite, LNT] Make the use of perf optional

[Yi Kong]

Committed r218054 and 218056 since no objection was raised and
execution time wasn't measured by Perf before anyway.

Cheers,
Yi

On 16 September 2014 14:42, Yi Kong <kongy.dev at gmail.com> wrote:
> Hi all,
>
> This patchset removes perf detection in timeit.sh and replace it with
> an option in LNT, so that user can have more control about which tool
> to use. Also this fixes my previous error which caused execution time
> not actually being measured using perf.
>
> Tobias, Renato: You will need to switch on "--use-perf" option in your
> zorg config to enable perf on your performance builders.
>
> Ok to commit?
>
> Cheers,
> Yi