Install docker-py for Docker Salt minions
Summary:
salt.modules.dockerng requires docker-py, the legacy package for
docker, a Python library for the Docker Engine API.
Fixes T1359.
References:
- https://docs.saltstack.com/en/latest/ref/modules/all/salt.modules.dockerng.html#installation-prerequisites
- https://pypi.python.org/pypi/docker-py
Test Plan: Deploy on Dwellers and Equatower
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1359
Differential Revision: https://devcentral.nasqueron.org/D1407