L2muon changes: L2MuonSeedGenerator, L2MuonProducer

The new code in packages L2MuonSeedGenerator, L2MuonProducer introduces the following options in L2 muon reconstruction for muon triggers: 
- possibility to request a mandatory matching between the L1 muon candidate and a trajectory seed (in L2MuonSeedGenerator); 
- possibility to configure the trajectory builder used in L2 track reconstruction (in L2MuonProducer). 

By default, the new code won't affect muon triggers: the new options can only be enabled with a proper configuration in ConfDB, if requested by the TSG. 

The standard tests (runTheMatrix) were run successfully in CMSSW_7_0_X_2013-12-16-1400 and CMSSW_7_0_0_pre10. The report can be found here: 

http://trocino.web.cern.ch/trocino/Temp/2013-12-17_runTheMatrix/runall-report-step123-.log

In order to run the tests, the new parameters must be added to the following HLT configurations
HLTrigger/Configuration/python/HLT_8E33v2_cff.py
HLTrigger/Configuration/python/HLT_8E33v2_Famos_cff.py
as shown here: 
http://trocino.web.cern.ch/trocino/Temp/2013-12-17_runTheMatrix/HLT_8E33v2_cff.py
http://trocino.web.cern.ch/trocino/Temp/2013-12-17_runTheMatrix/HLT_8E33v2_Famos_cff.py