Develop scripts to merge and verify PES events data

[andrewlukoshko]

Now when Red Hat started publishing pes-events.json file to their repo we should use it in ELevate.
So I propose to maintain our own minimal subset of ELevate specific actions and merge it with Red Hat data.

So we need a script that will merge Red Hat's pes-events.json with our PES json into single file.
Second script should verify PES files for valid JSON, unique actions id and set_id, etc.