CFY-1700 added the OS property and the post provision script.
CFY-1700 flake8
CFY-1700 merged with master
Update blueprint.yaml
Merge pull request #8 from cloudify-cosmo/CFY-1700-support-plain-vanilla

CFY-1700 added the OS property and the post provision script.
CFY-1717 validate python installed on a ready VM.