ACICreatewithACR.yml failed because of no package docker-py

[yungezz]

Please provide us with the following information:

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Minimal steps to reproduce

Any log messages given by the failure

TASK [Login docker registry] ***************************************************
fatal: [localhost]: FAILED! => {"changed": false, "msg": "Failed to import docker-py - No module named docker. Try `pip install docker-py`"}
to retry, use: --limit @/home/travis/build/Azure-Samples/ansible-playbooks/ACIcreatewithACR.retry

Expected/desired behavior

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Versions

Mention any other details that might be useful

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[zikalino]

Prequisite

===========

- git

- Docker

The prerequisites state that docker should be installed. What else should we do?

[yungezz]

in ci environemtn, install git and docker.