Use Python Docker package in version 5.x

Summary:
Salt tests docker.version to ensure the available version is >= 1.6.0.
This attribute has been removed in docker-py 6.

This fix won't work for onedir installations.

Ref T1764

Reviewers: DorianWinty

Reviewed By: DorianWinty

Maniphest Tasks: T1764

Differential Revision: https://devcentral.nasqueron.org/D2840