miniAOD in cmsDriver: fix for fastsim samples:
(--fast will replace some fastsim-incompatible MET filters with
 dummy boolean filters)
Tested successfully with: cmsDriver RelValTTbar_13-POSTLS170_V3_FastSim-v2 -s PAT -n 10000 --mc --fast --dasquery "file dataset=/RelValTTbar_13/CMSSW_7_0_0-POSTLS170_V3_FastSim-v2/GEN-SIM-DIGI-RECO" --eventcontent MINIAODSIM --runUnscheduled --conditions POSTLS170_V3::All --no_exec