fix job splitting for ACDC MCFakeFile

now also accepts a different job splitting

fix typo
Merge pull request #5478 from amaltaro/acdc-MCFakeFile

fix job splitting for ACDC MCFakeFile
fix priority mapping
Merge pull request #5483 from ticoann/fix_priority_wmstats

fix priority mapping
Merge branch 'master' of https://github.com/dmwm/WMCore into reqmgr2