azurerm_api_management: switch from 2018-06-01-preview to 2018-01-01 api

[katbyte]

fixes #2945

[katbyte]

tests:

==> Fixing source code with gofmt...
# This logic should match the search logic in scripts/gofmtcheck.sh
gofmt -s -w `find . -name '*.go' | grep -v vendor`
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./azurerm -v -test.run=TestAccAzureRMApiManagement -timeout 180m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccAzureRMApiManagement_basic
=== PAUSE TestAccAzureRMApiManagement_basic
=== RUN   TestAccAzureRMApiManagement_requiresImport
=== PAUSE TestAccAzureRMApiManagement_requiresImport
=== RUN   TestAccAzureRMApiManagement_customProps
=== PAUSE TestAccAzureRMApiManagement_customProps
=== RUN   TestAccAzureRMApiManagement_complete
=== PAUSE TestAccAzureRMApiManagement_complete
=== CONT  TestAccAzureRMApiManagement_basic
=== CONT  TestAccAzureRMApiManagement_complete
=== CONT  TestAccAzureRMApiManagement_customProps
=== CONT  TestAccAzureRMApiManagement_requiresImport
--- PASS: TestAccAzureRMApiManagement_complete (1781.49s)
--- PASS: TestAccAzureRMApiManagement_customProps (1900.65s)
--- PASS: TestAccAzureRMApiManagement_basic (1957.88s)
--- PASS: TestAccAzureRMApiManagement_requiresImport (2203.54s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	2203.589s
[14:26:15] kt@snowbook:~/hashi/..3../terraform-providers/terraform-provider-azurerm▸api/update_api$

[tombuildsstuff]

LGTM 👍

[ghost]

This has been released in version 1.23.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
	version = "~> 1.23.0"
}
# ... other configuration ...

[ghost]

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