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/requirements-test.txt b/requirements-test.txt
new file mode 100644
index 0000000..9cd0e0a
--- /dev/null
+++ b/requirements-test.txt
@@ -0,0 +1,3 @@
+six
+pyyaml
+coverage