HLT Run2 menu updates and fixes as from CMSHLT-91 and CMSHLT-81

HLT Run2 menu updates and fixes as from CMSHLT-91 (update the HLTEle27WP80GsfSequence as requestd from TOP PAG) and latest CMSHLT-81 (allow the paths in the ticket in the GRun menu after green light from STEAM).