Adding back python directory of EventFilter/ESRawToDigi

[davidlange6]

it seems that scram relies on a python directory to properly get the PYTHONPATH set. So temporarily add this back so that things work

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for CMSSW_7_4_X.

Adding back python directory of EventFilter/ESRawToDigi

It involves the following packages:

EventFilter/ESRawToDigi
PhysicsTools/PatAlgos
RecoBTag/Configuration
RecoBTag/ImpactParameter
RecoBTag/SecondaryVertex
RecoBTau/JetTagComputer

@nclopezo, @cvuosalo, @monttj, @cmsbuild, @slava77, @vadler can you please review it and eventually sign? Thanks.
@TaiSakuma, @imarches, @ahinzmann, @acaudron, @mmarionncern, @rappoccio, @Martin-Grunewald, @nhanvtran, @schoef, @ferencek, @mariadalfonso, @pvmulder this is something you requested to watch as well.
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