Remove unnecessary and dangerous mutable qualifiers

[wmtan]

This pull request removes the unnecessary and dangerous mutable qualifier from three InputTag data members of class L1GtUtils.
The qualifiers are unnecessary because these data members are not, in fact, modified, as everything builds fine when these qualifiers are removed.
These mutable qualifiers are dangerous for thread safety. They are also incompatible with the consumes interface, as the InputTags of consumed data members must be known at construction time.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_5_X.

Remove unnecessary and dangerous mutable qualifiers

It involves the following packages:

L1Trigger/GlobalTriggerAnalyzer

@cmsbuild, @nclopezo, @mulhearn can you please review it and eventually sign? Thanks.
@Martin-Grunewald this is something you requested to watch as well.
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@nclopezo you are the release manager for this.
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[cmsbuild]

+1
Tested at: 2c79aed
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8186/3285/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8186/3285/summary.html