Convert ESZeroSuppressionProducer to stream module

The static analyzer believes this module can safely be converted
to a stream module. This was also converted to make the DIGI workflow
more thread efficient.
Convert PileupInformation to stream module

The static analyzer believes this module can safely be converted
to a stream module. This was also converted to make the DIGI workflow
more thread efficient.
Merge pull request #6000 from Dr15Jones/streamPileupInformation

Convert PileupInformation to stream module
Merge pull request #5998 from Dr15Jones/streamESZeroSuppressionProducer

Convert ESZeroSuppressionProducer to stream module
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X