Clean couts validation seq

the filters in:
https://cmssdt.cern.ch/SDT/lxr/source/JetMETCorrections/Type1MET/python/pfMETCorrectionType0_cfi.py#0050

which actually don't filter anything, but are producers instead, are called in the validation sequence. the framework is complaining with messages like:

The EDFilter 'VertexSelector' with module label 'selectedVerticesForPFMEtCorrType0' appears on EndPath 'selectedVerticesForPFMEtCorrType0'.
The return value of the filter will be ignored.
To suppress this warning, either remove the filter from the endpath,
or explicitly ignore it in the configuration by using cms.ignore().


commit 6a51a32 cures the problem even if I don't particularly like this solution..  @slava77 
removing them is not an option..
Automatically ported from CMSSW_7_2_X #5335