4.14 perf test patches

[Rantala, Tommi T. (Nokia - FI/Espoo)]

Hi,

Can you pick these patches to 4.14.y?
These fix some "perf test" errors seen when running in VM.

commit 10836d9f9ac63d40ccfa756f871ce4ed51ae3b52
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
Date:   Mon Jul 3 16:50:30 2017 +0200

    perf tests attr: Fix task term values

commit f6a9820d572bd8384d982357cbad214b3a6c04bb
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
Date:   Thu Sep 28 18:06:33 2017 +0200

    perf tests attr: Fix group stat tests

commit 692f5a22cd284bb8233a38e3ed86881d2d9c89d4
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
Date:   Mon Oct 9 15:07:12 2017 +0200

    perf tests attr: Make hw events optional


-Tommi