docker module: incompatible with docker-py 1.2.x

[hryamzik]

See here and here for more details. Workaround is installing an older version of docker-py:

  tasks:
    - name: Install docker-py
      pip: name=docker-py version=1.1.0

And it could be set with pip_version_docker_py.

I'm not sure about a proper way to solve this. One of the solutions could be setting default pip_version_docker_py to 1.1.0 if ansible version is below some value.

[angstwad]

This was addressed in issue #40 and PR #41.

Use a parameterized role, and set pip_version_docker_py to 1.1. It was decided that since this is a transient issue in upstream packages that is due to be resolved, the default behavior should be to use the latest package, and the workaround to manually set a lower package version in the interim.