move fastsim addOn tests to use condDBv2. Add AutoCondGlobalTag version ...

This PR fixes the presently failing fastSim addOn tests in the 7_3_DEVEL branch. 
As I did not want to change the imported AutoCondGlobalTag.py file from HLT config, I simply "duplicated" it using the _condDBv2 postfix (AutoCondGlobalTag_condDBv2.py) - similarly to how it is done in other places (e.g. for the FrontierConditions.py in Configuration/StandardSequences and for the autoCond.py in Configuration/AlCa).