Relval 620slhc8

[boudoul]

fix the crash observed during the slhc8 relval production (harvesting step)
--> rename these harvesting tasks to always start with "HARVEST" as discussed here:
https://hypernews.cern.ch/HyperNews/CMS/get/wmDevelopment/596/1/1/1/1/1/2/1.html

[cmsbuild]

A new Pull Request was created by @boudoul (boudoul) for CMSSW_6_2_X_SLHC.

Relval 620slhc8

It involves the following packages:

Configuration/PyReleaseValidation

@nclopezo, @vlimant, @cmsbuild, @franzoni, @Degano, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
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@andersonjacob, @mark-grimes you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[andersonjacob]

merge

failures the same as #2657 for 13000 and for the others all results are the same as for #2647