Restore JupyterHub updates from PR-2427

[viniciusdc]

Reference Issues or PRs

What does this implement/fix?

Due to an issue with the latest release cycle, the changes made from PR #2427 were rolled back to complete the release; this PR re-introduces these changes.

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?

This merely restores the work originally created by the authors mentioned in the PR, to whom all credit is due.

[krassowski]

LGTM, thanks! I will follow-up with a set of PR to update it to 4.0.0-0.dev.git.6607.hd1a1130e which uses 5.0.0b2

[krassowski]

@viniciusdc looks good, can we ready to merge it (just because my subsequent PR will otherwise have merge conflicts)?