Moving GBRForestWriter to CommonTools/Utils

[ferencek]

This PR moves GBRForestWriter, a fairly general utility, to a more common and more appropriate location.

[cmsbuild]

A new Pull Request was created by @ferencek (Dinko Ferencek) for CMSSW_7_6_X.

Moving GBRForestWriter to CommonTools/Utils

It involves the following packages:

CommonTools/Utils

@cmsbuild, @cvuosalo, @vadler, @monttj, @slava77 can you please review it and eventually sign? Thanks.
@makortel this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[ferencek]

Hmm, this is a bit strange... Shouldn't bot be able to realize that there were also changes in RecoMET/METPUSubtraction

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 6b9238b
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10575/6965/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10575/6965/summary.html

[slava77]

+1

for #10575 6b9238b

• code move is OK, thanks.
• jenkins tests pass; GBRForestWriter is not a part of tested workflows. So, there are no changes.