RecJobTransforms: enable flake8 and package cleanup

Reconstruction/RecJobTransforms/CMakeLists.txt

Reconstruction/RecJobTransforms/python/BsConfig.py

Reconstruction/RecJobTransforms/python/MixStreamConfig.py

Reconstruction/RecJobTransforms/python/MixingSelector.py

Reconstruction/RecJobTransforms/python/RDOFilePeeker.py

Reconstruction/RecJobTransforms/python/RecConfig.py

Reconstruction/RecJobTransforms/python/recTransformUtils.py

Reconstruction/RecJobTransforms/python/recoTransforms.py

Reconstruction/RecJobTransforms/python/streaming_arg.py

...n/RecJobTransforms/share/TrigConfigForCosmic09RerunHLT.py

Reconstruction/RecJobTransforms/share/rawtodpd.py