* Added api_gateway_usage_plan

* Updated documentation

* Fixed AWS usage plan review points

credit to @tolis-sisiaridis for changes
Addresses https://github.com/hashicorp/terraform/issues/11126

Issue No. #12767

* Allow priority attribute of dnsimple_record to be set

Some DNS record types (like MX) allow a priority to specified, and the
ability to do so is important in many environments.

This diff will change dnsimple_record.priority from computed to
optional, allowing it to be used in terraform configs like so:

    resource "dnsimple_record" "mx1" {
        domain = "example.com"
        name = ""
        value = "mx1.example.com"
        type = "MX"
        priority = "1"
    }

    resource "dnsimple_record" "mx2" {
        domain = "example.com"
        name = ""
        value = "mx2.example.com"
        type = "MX"
        priority = "2"
    }

* mention new priority attribute of dnsimple_record

* add acceptance specs for creating/updating MX records at dnsimple

It changed with the logo, for brand reasons.

https://www.cloudflare.com/trademark/

terraform: unknown value for variables not set

This is an important optimization for dynamically created resources
via the `count` attribute.

* Vendor update `github.com/circonus-labs/circonus-gometrics`

* Add the `statsd` check type to the `circonus_check` resource.

* Noop change: Alpha-sort members of maps, variables, and docs.

Fixes #12836

Realistically, these should be caught during validation anyways. In this
case, this was causing 12386 because refresh with a data source will
attempt to use module variables. I don't see any clear logic to prune
those module variables or not add them so its easier to return unknown
to cause the data to be computed and not run.

Fix logic when skipping schema input

* Add KMS key tag support.

* After review, better error message when unable to list KMS key tags.

The Required||Optional logic in schemaMap.Input was incorrect, causing
it to always request input. Fix the logic, and the associated tests
which were passing "just because".

Convert dns data tests to acceptance tests

command: use backendinit instead of initializing legacy directly

fix race in hook ui PreApply test

Fix a race in the PreApply test, and make the PreApply background task
actually concealable.

Fixes #12806

This should've been part of https://github.com/hashicorp/terraform/commit/2c19aa69d9f4d4da43b1cedd17c5484c121fcc18

This is the same issue, just missed a spot. Tests are hard to cover for
this since we're removing the legacy backends one by one, eventually
it'll be gone. A good sign is that we don't import backendlegacy at all
anymore in command/

command/init: backend-config accepts key=value pairs

Adds the `name_prefix` to `aws_iam_group_policy`, `aws_iam_role_policy` and `aws_iam_user_policy`.