r/devspace: updating to API version 2019-04-01

[tombuildsstuff]

This PR updates the API version being used for Dev Space to 2019-04-01 - which requires that the host_suffix field becomes Computed rather than user-configurable.

Tests pass:

$ acctests azurerm TestAccAzureRMDevSpaceController_
=== RUN   TestAccAzureRMDevSpaceController_basic
=== PAUSE TestAccAzureRMDevSpaceController_basic
=== RUN   TestAccAzureRMDevSpaceController_requiresImport
--- SKIP: TestAccAzureRMDevSpaceController_requiresImport (0.00s)
    resource_arm_devspace_controller_test.go:42: Skipping since resources aren't required to be imported
=== CONT  TestAccAzureRMDevSpaceController_basic
--- PASS: TestAccAzureRMDevSpaceController_basic (1081.67s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	1081.771s

Fixes #3805
Supersedes #4288

[katbyte]

LGTM 👍

[ghost]

This has been released in version 1.36.0 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 = "~> 1.36.0"
}
# ... other configuration ...

[ghost]

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