Rebase of #7310 (cleaning RunTheMatrix)

[mark-grimes]

Github is saying #7310 has merge conflicts, even though I have no problems merging it locally onto the head. This pull request just rebases onto the current CMSSW_6_2_X_SLHC.

@boudoul

[mark-grimes]

merge

Skipping tests. Cmsbuild tested #7310, and I also ran a limited set of tests after merging locally on the current CMSSW_6_2_X_SLHC.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Rebase of #7310 (cleaning RunTheMatrix)

It involves the following packages:

Configuration/PyReleaseValidation

@cmsbuild, @srimanob, @nclopezo, @boudoul, @franzoni can you please review it and eventually sign? Thanks.
@ghellwig, @Martin-Grunewald this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@fratnikov, @mark-grimes you are the release manager for this.
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