provider/azurerm: Fix azurerm_virtual_machine windows_config

[stack72]

When using winrm config block, we had an address issue. This is no
longer a set but a list (As a list fits it more approp)

    make testacc TEST=./builtin/providers/azurerm
    TESTARGS='-run=TestAccAzureRMVirtualMachine_'
    ==> Checking that code complies with gofmt requirements...
    go generate $(go list ./... | grep -v /vendor/)
    TF_ACC=1 go test ./builtin/providers/azurerm -v
    -run=TestAccAzureRMVirtualMachine_ -timeout 120m
    === RUN   TestAccAzureRMVirtualMachine_basicLinuxMachine
    --- PASS: TestAccAzureRMVirtualMachine_basicLinuxMachine (587.80s)
    === RUN   TestAccAzureRMVirtualMachine_tags
    --- PASS: TestAccAzureRMVirtualMachine_tags (554.53s)
    === RUN   TestAccAzureRMVirtualMachine_updateMachineSize
    --- PASS: TestAccAzureRMVirtualMachine_updateMachineSize (612.52s)
    === RUN   TestAccAzureRMVirtualMachine_basicWindowsMachine
    --- PASS: TestAccAzureRMVirtualMachine_basicWindowsMachine (765.90s)
    === RUN   TestAccAzureRMVirtualMachine_windowsUnattendedConfig
    --- PASS: TestAccAzureRMVirtualMachine_windowsUnattendedConfig
    (770.53s)
    === RUN   TestAccAzureRMVirtualMachine_winRMConfig
    --- PASS: TestAccAzureRMVirtualMachine_winRMConfig (827.90s)
    PASS
    ok      github.com/hashicorp/terraform/builtin/providers/azurerm
    4119.192s

[jen20]

LGTM

[ghost]

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