Update Release processes files

[allmightyspiff]

Release process could use a bit of clarification and error checking.

[allmightyspiff]

• Update fabfile to check for required modules
• Update release.md to clarify all the steps needed to make a release
• Automate releases with github actions

[allmightyspiff]

Need to get account ownership of https://test.pypi.org/project/SoftLayer/, opened pypi/support#1025 to do so.

[allmightyspiff]

Describes how to automate publishing to PyPi
https://github.com/marketplace/actions/pypi-publish
https://packaging.python.org/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/

[allmightyspiff]

Since pypi doesn't let you re-use package names, and I don't want to fill up the test repo with junk releases, I think I'll just use this to test the release automation for now, and once I feel confident it will make releases properly, will change the job to push the release to normal pypi repo.