Peering of Cluster VNET to existing VNET

[jseely]

/kind feature

Describe the solution you'd like
When I deploy a new VNET, along with a new cluster, I would like to be able to specify an existing VNET for which to create a peering relationship with.

Anything else you would like to add:
Azure Docs - VNET Peering

[CecileRobertMichon]

/help

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[CecileRobertMichon]

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[CecileRobertMichon]

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[CecileRobertMichon]

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[CecileRobertMichon]

/remove-lifecycle stale

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[sshiba]

This feature combined with #1601 will allow to deploy a private flavor Workload cluster on Azure cluster without the need to manually creating its VNet and all that goes with it, prior to deploying the cluster.

It will make the deployment of a private Workload cluster much simpler and cleaner. No need to create an "external" script using Azure CLI to create the VNet and peering with the Management cluster's VNet.

[CecileRobertMichon]

@Jont828 can you please comment /assign here