add init -reconfigure flag

[jbardin]

The reconfigure flag will force init to ignore any saved backend state.
This is useful when a user does not want any backend migration to
happen, or if the saved configuration can't be loaded at all for some
reason.

[apparentlymart]

This seems reasonable to me.

I feel a little ambivalent about the name reconfigure since it doesn't connote for me the idea of ignoring the existing config and starting over, but I can't think of a better verb here. 🤷‍♂️

[apparentlymart]

There's a typo in the option name here

[apparentlymart]

Also typo here

[jbardin]

Thanks, I'm an expert at cut&paste errors ;)

[jbardin]

It is in essence "reconfiguring" since it currently acts as if the user removed .terraform/terraform.tfstate before running init (though it's possible in the future that other info in that "state" file could be used).

I also can't think of a better name, maybe -reconfigure-backend, though that seems a little long?

[apparentlymart]

After mulling this some more the only other idea I came up with was the rather-more-literal -ignore-existing-backend, which is also quite long. But perhaps this should be long because it's something that should rarely be used?

I don't feel strongly about the name, anyway. If you're happy with -reconfigure then feel free to ignore me. 😀

[jbardin]

Yeah, I didn't want to put "force" or "ignore" in there, because I was sort of leaving this open for adding some sanity checks if they become required, which means we might load the saved config, or add arguments to the -reconfigure flag.

[ghost]

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