SSH Runner: Fix several issues and refactor code #258

Job	Run time
Deploy to TestPyPI	0s
Linux test suite / Build Linux container	5s
OSX test suite / Setup and Cache Dependencies	1m 52s
Windows test suite / Functional Tests (3.13)	7m 30s
Windows test suite / Functional Tests (3.8)	7m 29s
Windows test suite / Unit & Integration Tests (3.13)	7m 37s
Windows test suite / Functional Tests (3.6)	7m 30s
Windows test suite / Unit & Integration Tests (3.8)	7m 38s
Windows test suite / Unit & Integration Tests (3.6)	7m 36s
Linux test suite / Unit Tests (3.13)	1m 40s
Linux test suite / Runner Tests (3.13)	1m 14s
Linux test suite / Integration Tests (3.13)	1m 44s
Linux test suite / Functional Tests (3.13)	1m 45s
Linux test suite / Runner Tests (3.9)	1m 30s
Linux test suite / Unit Tests (3.9)	1m 40s
Linux test suite / Integration Tests (3.9)	1m 43s
Linux test suite / Functional Tests (3.9)	1m 44s
Linux test suite / Unit Tests (3.8)	1m 43s
Linux test suite / Integration Tests (3.8)	1m 43s
Linux test suite / Functional Tests (3.8)	1m 44s
Linux test suite / Unit Tests (3.6)	1m 43s
Linux test suite / Integration Tests (3.6)	1m 43s
Linux test suite / Functional Tests (3.6)	1m 43s
OSX test suite / Unit Tests (3.8)	55s
OSX test suite / Integration Tests (3.8)	56s
OSX test suite / Functional Tests (3.8)	1m 3s
OSX test suite / Unit Tests (3.12)	50s
OSX test suite / Integration Tests (3.12)	1m 9s
OSX test suite / Functional Tests (3.12)	1m 11s
OSX test suite / Unit Tests (3.13)	52s
OSX test suite / Integration Tests (3.13)	1m 6s
OSX test suite / Functional Tests (3.13)	1m 13s
Code coverage	1s
	1h 19m 52s

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