More updates for event lists in perf list

[Andi Kleen]

This adds support for the event topics that Ingo requested, and
replaces the earlier event group patch. JSON files now have a Topic
header that is used by perf list to group events.

This applies on top of Sukadev's patchkit. In addition
the Intel events also need to be pulled from 

git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git perf/intel-json-files-3

-Andi

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