Unified command execution and unit tests

- All arguments inits moved to own clases
- Added unified way to execute commands
- Unit test structure and very basic tests
- Command line script to test coverage

Change-Id: I10bc973776595779b563b84548d46367bcd0886f
Related-PROD: PROD-28199
diff --git a/cover.sh b/cover.sh
new file mode 100644
index 0000000..49c73e5
--- /dev/null
+++ b/cover.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+coverage run --source cfg_checker setup.py test && coverage report