Update to 2020-07-01/network

[MirzaSikander]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Updates all the references for azure network API to point to 2020-07-01 . This is needed to consume new features like Edge Zones. This pull request only contains the update to new version so that it can be tested in isolation.
We decided not to update to 2020-08-01 because there are some concerns about breaking changes:
#403

Special notes for your reviewer:
Apart from the reference updates, there is only one logic change, which is in pkg/provider/azure_standard.go. Apparently, the property type for the field InterfacePropertiesFormat.ProvisioningState updated in between API versions, and is no longer a pointer type. Opened a bug on the azure sdk team: Azure/azure-sdk-for-go#14261

Also a test TestGetVirtualMachineScaleSetNetworkInterface in pkg/azureclients/interfaceclient/azure_interfaceclient_test.go had to be updated because it was setting a readonly field which doesn't get marshalled anymore. More info here:
Azure/azure-sdk-for-go#14263

Release note:

Updates all the references for azure network API to point to `2020-07-01` which is the latest API Version

[k8s-ci-robot]

Hi @MirzaSikander. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nilo19]

/ok-to-test

[feiskyer]

Refer #403, the new network API 2020-08-01 has introduced a breaking change about the availability zone. We need to ensure zone-redundant resources are created on AZ regions.

Do you any API to query AZ regions?

/hold

[nilo19]

According to our discussion, mirza would use 2020-07-01, which is sufficient for him.

[MirzaSikander]

I have updated the title and the pull request description to indicate that we are only switching to 2020-07-01.

[MirzaSikander]

As mentioned in the pull request description, a test TestGetVirtualMachineScaleSetNetworkInterface in pkg/azureclients/interfaceclient/azure_interfaceclient_test.go had to be updated because it was setting a readonly field which doesn't get marshalled anymore. More info here:
Azure/azure-sdk-for-go#14263

[feiskyer]

Could you also update the APIVersion for all the updated clients? one example is here (please do not touch AzureStackCloudAPIVersion):

cloud-provider-azure/pkg/azureclients/loadbalancerclient/interface.go

Lines 30 to 31 in 21a604f

	// APIVersion is the API version for network.
	APIVersion = "2019-06-01"

[feiskyer]

As mentioned in the pull request description, a test TestGetVirtualMachineScaleSetNetworkInterface in pkg/azureclients/interfaceclient/azure_interfaceclient_test.go had to be updated because it was setting a readonly field which doesn't get marshalled anymore. More info here:

Could you fix this test failure?

[MirzaSikander]

@feiskyer The clients have been updated and the test is fixed.

[nilo19]

/lgtm

[feiskyer]

/lgtm
/approve

/hold cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feiskyer, MirzaSikander

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