Add test case for multiple network profiles in virtual machine scale set model

[dominik-lekse]

This pull request add the test case TestAccAzureRMVirtualMachineScaleSet_multipleNetworkProfiles which tests creating a virtual machine scale set with multiple network_profiles. This is currently allowed by the Terraform schema and the documentation of the azurerm_virtual_machine_scale_set resource but fails since the currently used version of the Azure SDK for Go applies the Azure API version 2016-04-30-preview for managing virtual machine scale sets.

The pull request #367 upgrades to v11 of the Azure SDK for Go which uses the Azure API version 2017-03-30 for managing virtual machine scale sets. Thus, this test will turn green after #367 is merged confirming the feature of using multiple network profiles.

make testacc TEST=./azurerm TESTARGS='-run=TestAccAzureRMVirtualMachineScaleSet_multipleNetworkProfiles'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./azurerm -v -run=TestAccAzureRMVirtualMachineScaleSet_multipleNetworkProfiles -timeout 120m
=== RUN   TestAccAzureRMVirtualMachineScaleSet_multipleNetworkProfiles
--- FAIL: TestAccAzureRMVirtualMachineScaleSet_multipleNetworkProfiles (96.34s)
	testing.go:434: Step 0 error: Error applying: 1 error(s) occurred:

		* azurerm_virtual_machine_scale_set.test: 1 error(s) occurred:

		* azurerm_virtual_machine_scale_set.test: compute.VirtualMachineScaleSetsClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="MinimumApiVersionNotSpecifiedForMultiNetworkInterfaceConfigurationOnVMScaleSet" Message="Specified api-version 2016-04-30-preview does not meet the minimum required api-version 2017-03-30 for multiple network interface configurations on VM Scale Set. Use api-version 2017-03-30 or higher to use multiple network interface configurations on VM Scale Set." Details=[]
FAIL
exit status 1
FAIL	github.com/terraform-providers/terraform-provider-azurerm/azurerm	96.363s
make: *** [testacc] Error 1

[tombuildsstuff]

Hey @dominik-lekse

Thanks for this PR - I've taken a look and this LGTM. As you've mentioned this is blocked on #367 - and we'll merge this after that :)

Thanks!

[ghost]

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