Fixes #2535.

[rdtr]

I believe now it's regarded to be better to use a declarative configuration in a file for remote backend configuration rather than passing them as arguments in the command.

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This change is 

[k8s-ci-robot]

Hi @rdtr. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with @k8s-bot ok to test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[chrislovecnm]

@k8s-bot ok to test

[chrislovecnm]

Need someone with TF experience to review ;). Probably @geojaz or @justinsb

[justinsb]

I like this, but will revisit once we get 1.6.0 out the door (i.e. not a blocker?)

[chrislovecnm]

@k8s-bot ok to test

[chrislovecnm]

@geojaz can you review, no sure what your knowledge around TF is. Pease un-assign yourself if you are not able to.

/assign @geojaz

[justinsb]

Sorry for delay on this one - looks great, particularly as we're now requiring a TF version where the old form doesn't work!