Add inline python functions from ChallengeWorkflowTemplate

[thomasyu888]

per @andrewelamb and his work with the templates, the fact that toil requires the use of 2.7 doesn't mean that the tools used in the workflow should fall under this restriction.

• get docker configuration
• download submission

[andrewelamb]

Validate docker

• The inline python here doesn't work in python3:
• https://github.com/Sage-Bionetworks/ChallengeWorkflowTemplates/blob/master/validate_docker.cwl

Run Docker

• Unclear if this code works in python3
• https://github.com/Sage-Bionetworks/ChallengeWorkflowTemplates/blob/master/run_docker.cwl

[thomasyu888]

#86

[thomasyu888]

All workflows tools that can be run in containers are now run in containers.