remove tcMet from the event contents of RECO and AOD

As we discussed at the RECO meeting on 17-Apr-2014: https://indico.cern.ch/event/313948/contribution/18, I am trying to remove *tcMet* from the event contents of RECO and AOD.

This PR simply removes *tcMet* and its related value map from the event contents. 

However, it fails one of the matrix tests:

    runTheMatrix.py -l 1000.0

It fails at step3.

I don't know exactly how to fix it. I think that many files under
https://github.com/cms-sw/cmssw/tree/CMSSW_7_1_0_pre7/Configuration/Skimming/test/tier1
need to be modified.

I am not very familiar with files in Configuration/Skimming. Is it ok for me to make the changes in Configuration/Skimming and pull requests?