add a customisation fragment to check EventSetup usage

customiseCheckEventSetup:
customise a process to
  - print the list of ESSources and ESProducers
  - add a module to print all available EventSetup data
  - add a module to print all the used EventSetup data

PrintEventSetupContent:
  - migrate from legacy to 'one' module
  - reduce the number of LogSystem calls
  - add an option to make the output format consistent with that
    of PrintEventSetupDataRetrieval

PrintEventSetupDataRetrieval:
  - reduce the number of LogSystem calls
Merge pull request #6783 from fwyzard/customiseCheckEventSetup

add a customisation fragment to check EventSetup usage