Fixed thread-safety issues with PixelToFEDAssociateFromAscii

[Dr15Jones]

Changed the class statics to be member data. This avoids potential
thread-safety issues. The additional minor changes were to support
this change or to make mainentance easier. The exact functionality
of this class was unchanged.

[Dr15Jones]

This function was not declared in the base class and no classes inherit fro PixelToFEDAssociateFromAscii therefore no need for it to be virtual.

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for CMSSW_7_1_X.

Fixed thread-safety issues with PixelToFEDAssociateFromAscii

It involves the following packages:

CalibTracker/SiPixelConnectivity

@cmsbuild, @Degano, @diguida, @rcastello, @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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@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[rcastello]

+1
if test is succesful

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes or unless it breaks tests. @nclopezo, @ktf can you please take care of it?

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2775/412/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). @nclopezo, @ktf can you please take care of it?