Fixing overdoing of EventSetup pointer initialization
reverting commits b9e1929c5e8b0269eef89c0c4feaa1bbb8712f58 and 078138b30daa90abfea2e7eb7538aed987e9e7e1 

Reverting commits regarding unsafe treatment of EventSetup
Merge pull request #6085 from mmusich/fixTrackerOfflineValidationMemory

Fixing initialization of event setup point of PR 6030
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X