Small adjustments to the HLT menu for 720 and above

Small adjustments to the Run2 HLT menu that could go into final 720 if accepted (and then also forward ported to 73X once all other L1 stuffs will get forward ported):

- rename L1/L2/L3 muon filters according to the name of the new L1 seed (instead of the almost random and meaningless names they have in pre7);

- Restore HLT_ZeroBias in the menu, CMSHLT-117;

- Drop HLT_DoubleMu4_Jpsi_Displaced_v1 from the master table, CMSHLT-118;

- Substitute DA --> DA_vect in hltOnlinePrimaryVertices, as it is done in the other primaryVertex producer in the menu, CMSHLT-119: no effect on the physics, only faster processing time for that producer