13 TeV mc relvals pre8 re cycle 70x fixes and updates

+ fix of 2 input GEN-SIM which were left w/o input to step2 (thread "clean up of relval eos space")

+ INPUT steps provided to the _13TeV workflows, using newly available GEN-SIM (announced here: https://hypernews.cern.ch/HyperNews/CMS/get/datasets/2777.html)

+ inclusion of HLT step in _13TeV workflows (previously menu not available); this will remove the crashes in step3  edm::TriggerResults (thread: https://hypernews.cern.ch/HyperNews/CMS/get/swReleases/3932.html). The  L1 and HLT now included are currently the best approximation of what will eventually  develop into the MC 2015 trigger

+ fix for missing record in step3 (GBRWrapperRcd) still outstanding => will follow soon.