Resolve Dockermod incompatibility with docker-py 6.0.0

[rittycat]

What does this PR do?

Resolve inability for dockermod to fetch the version on docker-py 6.0.0+

What issues does this PR fix or reference?

Fixes:

• Change in docker-py to use a docker.__version__ string instead of docker.version_info tuple https://github.com/docker/docker-py/releases/tag/6.0.0

Previous Behavior

Attempted to retrieve version info from docker.version_info

New Behavior

The same, but on failure will attempt to retrieve version info from docker.__version__ and convert it to a tuple of ints

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

[welcome]

Hi there! Welcome to the Salt Community! Thank you for making your first contribution. We have a lengthy process for issues and PRs. Someone from the Core Team will follow up as soon as possible. In the meantime, here’s some information that may help as you continue your Salt journey.
Please be sure to review our Code of Conduct. Also, check out some of our community resources including:

• Community Wiki
• Salt’s Contributor Guide
• Join our Community Slack
• IRC on LiberaChat
• Salt Project YouTube channel
• Salt Project Twitch channel

There are lots of ways to get involved in our community. Every month, there are around a dozen opportunities to meet with other contributors and the Salt Core team and collaborate in real time. The best way to keep track is by subscribing to the Salt Community Events Calendar.
If you have additional questions, email us at [email protected]. We’re glad you’ve joined our community and look forward to doing awesome things with you!

[welcome]

Congratulations on your first PR being merged! 🎉

[chateaulav]

does not resolve overall dockermod issue, as seen here: #62602