Replace map in Terraform scripts with tomap (#7576)

[tkob]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

With this PR, Terraform scripts under contrib/terraform/aws will be able to work with newer versions (0.12+) of Terraform.

Which issue(s) this PR fixes:

Fixes #7576

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Terraform 0.12+ is required to run scripts under contrib/terraform/aws

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[floryut]

@tkob can you please check the formatting errors on CI jobs ?

[floryut]

/ok-to-test

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, tkob

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[oomichi]

/lgtm