GSoC 2018 Ideas: Plone CLI docker support

@avoinea @alecghica could please you also give your input to the idea of building some helpers inside bobtemplates.plone/plonecli for creating docker containers. I know that you are using docker a lot and I really would appreciate getting feedback from you.

For anyone who isinterested in this topic, we have an open task in the current GSoC project for this:

You ideas are highly appreciated!