R5.0.1 - multicloud :: Azure :: availability_zone set to "1" fails.

Default value of availability_zone is set to "1" and terraform fails applying this config

contrail-multi-cloud/transform/infrastructure/terraform_azure.py

        if instance.availability_zone:
            self.availability_zone = instance.availability_zone
        else:
            self.availability_zone = '1'

ERROR
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Error: Error applying plan:

5 error(s) occurred:

* azurerm_virtual_machine.compute-ritam-test-1-b: 1 error(s) occurred:

* azurerm_virtual_machine.compute-ritam-test-1-b: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="ResourceTypeNotSupportAvailabilityZones" Message="The resource type 'virtualMachines' does not support availability zones at location 'westindia' and api-version '2017-12-01'."
* azurerm_virtual_machine.compute-ritam-test-1-a: 1 error(s) occurred:

* azurerm_virtual_machine.compute-ritam-test-1-a: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="ResourceTypeNotSupportAvailabilityZones" Message="The resource type 'virtualMachines' does not support availability zones at location 'westindia' and api-version '2017-12-01'."
* azurerm_public_ip.gw-ritam-test-1-b_subnet-ritam-test-1-b-public: 1 error(s) occurred:

* azurerm_public_ip.gw-ritam-test-1-b_subnet-ritam-test-1-b-public: Error Creating/Updating Public IP "gw-ritam-test-1-b_subnet-ritam-test-1-b-public" (Resource Group "contrail-test-west-india"): network.PublicIPAddressesClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="ResourceTypeNotSupportAvailabilityZones" Message="The resource type 'publicIPAddresses' does not support availability zones at location 'westindia' and api-version '2018-04-01'."
* azurerm_public_ip.gw-ritam-test-1-a_subnet-ritam-test-1-a-public: 1 error(s) occurred:

* azurerm_public_ip.gw-ritam-test-1-a_subnet-ritam-test-1-a-public: Error Creating/Updating Public IP "gw-ritam-test-1-a_subnet-ritam-test-1-a-public" (Resource Group "contrail-test-west-india"): network.PublicIPAddressesClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="ResourceTypeNotSupportAvailabilityZones" Message="The resource type 'publicIPAddresses' does not support availability zones at location 'westindia' and api-version '2018-04-01'."
* azurerm_virtual_machine.controller-ritam-test-1-a: 1 error(s) occurred:

* azurerm_virtual_machine.controller-ritam-test-1-a: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="ResourceTypeNotSupportAvailabilityZones" Message="The resource type 'virtualMachines' does not support availability zones at location 'westindia' and api-version '2017-12-01'."

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.

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Removing availability zone from azure.tf.json applies the topology successfully.

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REMOVE THE BELOW FROM azure.tf.json file

                "zones": [
                    "1"
                ]