Use http port from config while checking hub

[dongmok]

This patch loads the configuration to specify http port while checking the hub, to fix the issue #588

On check_hub_ready

• Add / update documentation
• Add tests

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[GeorgianaElena]

This looks good @dongmok, thanks 🎉

There was a issue with the tests (the failures are unrelated with your changes), but that should be fixed now. Do you mind rebasing your PR to make sure everything's green?

[GeorgianaElena]

@dongmok, hope you don't mind that I've force-pushed the changes from tljh-master to your fork, so that we only have your commit in this PR.

Once everything is green, I plan to merge 🎉 Thanks a lot for solving the issue 🌻

[dongmok]

@dongmok, hope you don't mind that I've force-pushed the changes from tljh-master to your fork, so that we only have your commit in this PR.

No problem. Thanks

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