prepare to delete old definitions of corrected CaloMETs

This PR prepares to delete *caloType1CorrectedMet* and *caloType1p2CorrectedMet*, which have been replaced by *caloMetT1* and *caloMetT1T2* respectively, which are defined at:
https://github.com/cms-sw/cmssw/blob/CMSSW_7_1_0_pre8/JetMETCorrections/Type1MET/python/correctedMet_cff.py

The MET workbook started using these *caloMetT1* and *caloMetT1T2* at its revision 155:
https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookMetAnalysis?rev=155

Similarly, we plan to delete *pfType1CorrectedMet* and *pfType1p2CorrectedMet* soon. These have been replaced by *pfMetT1* and *pfMetT1T2* respectively.