Create basic integration python invoke script

[Grokzen]

We have a need for a integration test script that can be rerun locally any number of times that will run all commands in a few different ways and corner cases just to exercise what commands should be possible to run in what situation. This script or feature is not something done within pytest/unittests as it should be a shell script or possible a invoke script that really runs commands like subgit status or subgit pull.

This will require a set of different config files and config files that should be possible to run and use.

This feature is needed to compliment any normal unittests as doing complex integration tests within this type of code is difficult and it is both much cheaper, simpler and more effective to run a series of cli commands instead designed to test this on a integration test level instead.