Cleanup Dockerfiles #2145

Job	Run time
Scan Sourcecode with Cppcheck	3m 55s
Build dpsimpy on Fedora Linux	12m 37s
Run pytest over all notebooks	33m 35s
Build Cxx examples on Fedora Linux	27m 21s
Run dpsim-mqtt VILLASnode example / Run a VILLASnode example across multiple containers	2m 57s
Run dpsim-mqtt-import-export VILLASnode example / Run a VILLASnode example across multiple containers	2m 47s
Run dpsim-mqtt-import-export-MIMO VILLASnode example / Run a VILLASnode example across multiple containers	3m 44s
Run dpsim-file VILLASnode example / Run a VILLASnode example across multiple containers	8m 28s
Run mqtt-cigre-mv-pf-profiles VILLASnode example / Run a VILLASnode example across multiple containers	7m 40s
Execute Example	2m 37s
Compare Notebook results	2m 2s
	1h 47m 43s

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