InDetConfig examples bug fixes in SpacePointFinder.py and PreProcessingSiliconTestConfig.py (+ add new file SiliconPreProcessing.py)

Merged Artem Vasyukov requested to merge avasyuko/athena:CI-SiliconPreProcessing-16102020 into master

There were deprecated configurations due to Athena latest updates. SpacePointFinder.py and PreProcessingSiliconTestConfig.py have been modified and merged into SiliconPreProcessing.py; SpacePointFinder.py and PreProcessingSiliconTestConfig.py should be removed later.

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