Remove edm::EventSetup argument from TransientInitialStateEstimator constructor

Better to construct it in the constructor of
CkfTrackCandidateMakerBase in order to not to need to have
edm::ParameterSet member.
TransientInitialStateEstimator::setEventSetup() is anyway called on each
event.

Transform ConversionTrackFinder and deriving classes similarly as a
knock-on.
Remove CkfTrackCandidataMakerBase::conf_ member
Remove ConversionTrackFinder::conf_ member
Move construction of SeedComparitor from mergeTriplets to constructor in QuadrupletSeedMerger
Remove SeedGeneratorFromRegionHitsEDProducer::theConfig member
Convert raw pointer members of SeedGeneratorFromRegionHitsEDProducer to std::unique_ptr
Remove empty beginRun() and endRun() from SeedGeneratorFromRegionHitsEDProducer