Handle menu chains outside of the config flags (HLT newJO)

This MR changes the way the menu chains are handled. They used to be part of the job flags which was suboptimal for several reasons. Now they are just put in a simple dict and passed between two functions.

Trigger/TriggerCommon/TriggerJobOpts/python/MenuConfigFlags.py

-
-# Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
-
-from AthenaConfiguration.AthConfigFlags import AthConfigFlags
-
-
-def createMenuFlags():
-    # this flags define which chains are in trgger menu
-    # the flags content is not just the name bu contains a few key elements of the chains definition, like the seed, other chain aspects can be added
-    # The DF/CF and hypos are then generated using the menu code
-    # Should the HLT_ and L1_ prefixes are omitted (DRY principle)?
-    # each flag is translated to an independent reconstruction chain
-    flags = AthConfigFlags()
-
-    #flags.addFlag('Trigger.menu.muons', [])
-    flags.addFlag('Trigger.menu.muon', [])
-    flags.addFlag('Trigger.menu.electron', [])
-    flags.addFlag('Trigger.menu.photon', [])
-    flags.addFlag('Trigger.menu.jet', [])
-    flags.addFlag('Trigger.menu.combined', [])
-
-    return flags
-
-
-class MenuUtils(object):
-    @staticmethod
-    def toCTPSeedingDict( flags ):
-        seeding = {} # HLTChain to L1 item mapping
-        for k,v in flags._flagdict.iteritems():
-            if "Trigger.menu." in k:
-                for chain in v.get():
-                    hlt = chain.name                    
-                    l1 = hlt[hlt.index("_L1")+1:].replace("L1","L1_", 1)
-                    seeding[hlt] = l1 # this is the item name
-        return seeding
-
-import unittest
-class __MustHaveMenuInTheName(unittest.TestCase):    
-    def runTest(self):
-        flags = createMenuFlags()
-        for fname,fval in flags._flagdict.items():
-            self.assertTrue( fname.startswith('Trigger.menu.') )
-