Azure InstanceType case sensitive

[suker200]

Hi,
I met an issue relate to case sensitive instance type in Azure response.

https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/azure/azure_scale_set.go#L429
https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/azure/azure_instance_types.go#L640

The value of "*template.Sku.Name" is : Standard_D8_V3
But the key of "InstanceTypes" is: Standard_D8_v3

It made cluster autoscaler failed.

I have workaround add

	"Standard_D8_v3": {
		InstanceType: "Standard_D8_v3",
		VCPU:         8,
		MemoryMb:     32768,
		GPU:          0,
	},
	"Standard_D8_V3": {
		InstanceType: "Standard_D8_V3",
		VCPU:         8,
		MemoryMb:     32768,
		GPU:          0,
	},

to "InstanceTypes" and cluster-autoscaler works as normal

[feiskyer]

@suker200 Thanks for reporting the issue. This should be fixed within CA. Would file a PR to fix it.

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[feiskyer]

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