Refactor code + add support for multinode clusters

[mnaser]

This is a big refactor that covers a few things:

1. Refactor to use molecule-plugins for the Docker bits, so we don't have to keep a local copy of these, relying on the Docker driver instead to do the heavy lifting for us.
2. Fix all of the tests so that they are all passing
3. Implement the ability to have multi-node KinD clusters that you can define inside platforms with different roles and labels
4. Add testing to make sure both old existing clusters and new multinode clusters code still works fine
5. Improved login support so now login can login to any of the kind nodes in multinode scenario

Indirectly, it also fixes #1 which means you can actually run against the target containers (and that's tested in the code with the ping that is being done against them all).

Thanks! Would appreciate a release once you merge this if it is all good :)

[mnaser]

@retr0h do you mind pressing the button to run tests if you have a second? :)

[mnaser]

ahh, darn, the newer images of KinD don't have any python.. do you think i should install it out of the box or do it in the prepare step and then users can override that?

[retr0h]

ahh, darn, the newer images of KinD don't have any python.. do you think i should install it out of the box or do it in the prepare step and then users can override that?

Not sure, but looks like unit tests are failing, doesn't look related to kind images not having python.

[mnaser]

The unit tests run a whole molecule scenario 😅