Changed HcalRecHitsAnalyzer to thread_unsafe since it uses HcalChannelQuality

Changed HcalRecHitsAnalyzer to inherit from thread_unsafe::DQMEDAnalyzer.
This was needed since the module used HcalChannelQuality with is a thread
unsafe EventSetup product.
This was found by the static analyzer.
Merge pull request #4462 from Dr15Jones/setHcalRecHitsAnalyzerToThreadUnsafe

Changed HcalRecHitsAnalyzer to thread_unsafe since it uses HcalChannelQuality