FastSim customizations for hlt run2

Apply the needed customization for running also in FastSim the HLT paths which are going to be prepared for the run2 menu.
In principle, I could have done it without modifying the FastSim HLT menu in the current CMSSW release. However, while preparing such a customization, I was able to recover a few HLT paths that were so far removed from the FastSim HLT menu [1]. Since the recover of those new paths comes for free, I have included it in the pull request. However, if this is not wanted, or if it can become the reason to delay the merging of this pull request, please @lveldere answer here as suche and I will revert it by keeping in this PR only the definitions of the additional modules needed for the developing HLT run2 menu in FastSim.

[1]
-    "HLT_DoubleMediumIsoPFTau30_Trk1_eta2p1_Reg_Jet30_v*", 
 -    "HLT_DoubleMediumIsoPFTau30_Trk1_eta2p1_Reg_v*",
 -    "HLT_DoubleMediumIsoPFTau35_Trk1_eta2p1_Prong1_Reg_v*",
 -    "HLT_DoubleMediumIsoPFTau35_Trk1_eta2p1_Reg_v*",
 -    "HLT_IsoMu18_eta2p1_MediumIsoPFTau25_Trk1_eta2p1_Reg_v*",
 -    "HLT_DoubleMediumIsoPFTau45_Trk1_eta2p1_Reg_Jet30_v*",
 -    "HLT_DoubleMediumIsoPFTau50_Trk1_eta2p1_Prong1_Reg_v*",
 -    "HLT_IsoMu26_eta2p1_MediumIsoPFTau30_Trk1_eta2p1_Reg_v*",