rename `master*` properties in cluster environments to `main*`

[awaelchli]

🚀 Feature

Refactor our internal language for master port and master address in the cluster environments and accelerators.

Motivation

Inclusive language

Pitch

rename to main_address and main_port

Alternatives

other name suggestions welcome

Additional context

Lightning may also rename "master" branch to "main" soon.

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[awaelchli]

This may be combined with #6303 where we propose to make the methods properties.

[Arnab1181412]

Sir can I work on this issue I'm a new contributor

[awaelchli]

Yes, that would be great!
Here is what I had in mind we need to do:

1. Deprecate master_address() and master_port() method
2. Add new properties main_address and main_port
3. Replace all occurrences in Lightning with new calls

Feel free to send a PR for these items and let me know if you have any questions :)
You can find the contributing guide here: https://github.com/PyTorchLightning/pytorch-lightning/blob/master/.github/CONTRIBUTING.md

[alli1999]

Hi could I contribute in this too? It would be my first contribution

[bamblebam]

The kubeflow and other environments also have master properties in them so maybe we should try and change them too

[awaelchli]

@alli1999 If @Arnab1181412 didn't start yet (it does not seems so) feel free to take it.
Yes @bamblebam it needs to be renamed everywhere (simple find and replace)

See my comment above for directions

[alli1999]

Sure I'll work on it. We just replace master_address() and master_port() with main_address() and main_port()

[alli1999]

I've done the changes to all the methods. Should I create a pr?

[awaelchli]

@alli1999 Yes. You can go to the tab on top here "Pull Requests" and you should see a button to open it. Then read the template and fill it out. Then me and the other members will review the changes and help you finish it.
Thanks for your help.