In the demo code, the directives (koji, python, etc.) are all loaded at run time. While this works for the time being, it will start contributing to undesired side-effects as we add functionality.
- increased imports @ runtime
- longer requires (instead of optional requires)
- invitation to more tightly coupled code

Change the code around so that directive modules are only loaded if they are used in the task description.

simple example:

preparation:
foo: somearg
execution:
bar: someotherarg

In this case, the only directive modules loaded would be foo and bar. baz could be implemented but it would not be loaded.