Declare constant statics const

[wmtan]

Declare statics in the framework that are never modified as "const". These were detected by the static analyzer.
This pull request is just for those found and fixed today. There will be more.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_0_X.

Declare constant statics const

It involves the following packages:

FWCore/Utilities
FWCore/RootAutoLibraryLoader
FWCore/PluginManager
FWCore/Framework

@smuzaffar, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@ktf you are the release manager for this.

[Dr15Jones]

+1
As long as these pass the usual pre-tests

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IBs unless changes or unless it breaks tests. @ktf can you please take care of it?

[Dr15Jones]

There was no reason to declare the return type 'const' since it was already a copy

[cmsbuild]

Pull request #1214 was updated. @smuzaffar, @Dr15Jones, @ktf, @nclopezo can you please check and sign again.

[nclopezo]

+1
the errors in the unit tests are the ones that were already in the IB:

https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/1057/summary.html