Remove Hetzner Cloud driver from core

[decentral1se]

Will live @ https://github.com/pycontribs/molecule-hetznercloud

[ssbarnea]

I know that I cannot say no to reviews that are removing code.

[till]

@decentral1se How do you use this with head? Now:

ERROR: Failed to validate.

{'driver': [{'name': ['unallowed value hetznercloud']}]}

Dockerfile:

FROM quay.io/ansible/molecule:latest
RUN apk add --update build-base git
RUN pip install --upgrade pip
RUN pip install dnspython requests==2.20.1 docker docker-compose hcloud molecule[hetznercloud]
RUN pip install git+https://github.com/pycontribs/molecule-hetznercloud.git@master#egg=molecule-hetznercloud

[decentral1se]

Hey @till, sorry you ran into so many issues. We're in a transition period now and I shouldn't have recommended this approach. At current state, you should pip install -e . the molecule source and then run the pip install git+https://github.com/pycontribs/molecule-hetznercloud.git@master#egg=molecule-hetznercloud command but I've done that now and found another few issues. I better go raise those tickets 😅

[ssbarnea]

As drivers can request their minimal version of molecule needed, including prerelease, it would be easier to document “pip install molecule-drivername” as the way to install them.