[WIP] Update parameter parsing and fix dry_run

[fsck]

Trying to fix #41 as discussed previously. Feel feel to push to this branch @Trolldemorted

[Trolldemorted]

What has gotta be done?

Do we need a dry run? If it means 'not deploying', you can leave the servers empty, if it means 'not storing' it doesn't make much sense.

[fsck]

I would interpret it as do everything but deploy. This would also makes sense for our internal testing (I think), as we can do everything up until actually connecting over ssh, without a valid remote end.

What needs to be done: Testing it a bit more and fixing the docker container because looking at it again this morning I probably messed up the parameters in the entry point.

[Trolldemorted]

I am not certain that a parameter for that does make sense. If you do not want to deploy, you can always add no servers or just not hit the deploy button.

[fsck]

Because we might actually want to preconfigure the targets but not actually run them in a preparation to an event or, more importantly, we want to actually exercise the code paths in tests without having an live remote available. We need to think about a sensible testing strategy anyway.