[AKS] az aks create: Add support for Windows

[AbelHu]

Description
This will allow cx to create a k8s cluster and then add Windows agent pools without aks-preview.

Testing Guide
AZURE_CLI_TEST_DEV_SP_NAME=1f3a7c5e-1812-4aa7-bffe-b5ef651cbab2 AZURE_CLI_TEST_DEV_SP_PASSWORD='6997d05f-3cae-4bcc-95f0-b74cf5444860' CAZURE_CLI_TEST_MODULES=acs azdev test test_aks_create_with_windows --discover --live

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[yungezz]

HI @arrownj could you pls review? thanks

[arrownj]

LGTM

[AbelHu]

Thanks for the help, @arrownj . Please do not merge this. I will update add-node-pool with setting default node vm size for windows but not raise an error.

[AbelHu]

Updated src\azure-cli\azure\cli\command_modules\acs\custom.py and added `add/delete windows node pool' in test_aks_commands.py
Change Line 2826

    if node_vm_size is None:
        if os_type.lower() == "windows":
            raise CLIError('Windows nodepool is not supported')
        node_vm_size = "Standard_DS2_v2"

=>

    if node_vm_size is None:
        if os_type == "Windows":
            node_vm_size = "Standard_D2s_v3"
        else:
            node_vm_size = "Standard_DS2_v2"

[arrownj]

Hi @AbelHu , is this ready to merge ? Code looks good to me.

[AbelHu]

@arrownj . It is ready now. Expect your help to merge it. Thanks.