[Py3] Some salt-cloud drivers do not work using Python 3

[rallytime]

Description of Issue/Question

The Joyent driver, as well as any driver using apache-libcloud, does not currently work when using Python 3.

Details for this issue can be found in this comment and this comment. This problem was initially found with the Joyent salt-cloud driver, as explained in issue saltstack/salt-ci-images#396, but this also affects gce, cloudstack, dimensiondata, and openstack.

This is happening on the Nitrogen branch when running salt-cloud with the aforementioned drivers when running with Python 3. Python 2 still works fine.

I am going to add a note to the Nitrogen release notes as a known issue for the time being, until we can get this fixed. I will link the issue when I have submitted the PR.

@tonybaloney This might be something you're interested in.

cc: @cachedout, @Ch3LL, @gtmanfred, and @techhat

[cachedout]

@rallytime I don't think a PR ever got linked here, fwiw.

[rallytime]

@cachedout That's true. I am waiting for something to be added first, and then appending it to. I didn't state that here, though. I'll link it when I am able to submit the release note change. Thank you for the reminder!

[rallytime]

The note about this issue was added to the 2017.7.0 release notes with PR #41852. (Thanks @Ch3LL!)

[gtmanfred]

This is fixed by #42529