WIP/evaluation: Using optionally Docker to prevent compatibility problems with Analyzers

[3c7]

This is WIP and needs discussion.

[BrevilleBro]

Good work @3c7 , I think this is the way forward for Cortex analyzers if we want to maintain compatibility.

[ghost]

Would this allow cortex analyzers to start running on different Docker images (Windows)? For example I could see a cortex analyzer that check Office 365 block lists which are only available over PowerShell at the moment.

[geekscrapy]

@ryanmcvicar I guess if you used docker swarm that'd be fairly easy to distribute analyzers across platforms

[3c7]

• Fix cortex-base-python3 image
• Fix unterminated quoted string bug
• Check for possibilities to reduce image sizes

[3c7]

Basically finished, just postponed to the next cortex (bugfix) release.

[3c7]

Continued in #334 as I cannot change the branch.