Initialize and format disks in 101-vm-multiple-data-disk

[101-vm-multiple-data-disk](https://github.com/Azure/azure-quickstart-templates/tree/master/101-vm-multiple-data-disk)

### Issue Details

I find this template a bit incomplete as the created disks are not initialized and formatted. Isn't the point of these automated deployments to do everything in there and not having to RDP to the VM and finish up?

Can the template be expanded so that the disks are initialized and one partition per disk is created with a given drive letter? That would help immensely.

Start in the linked 101-vm-multiple-data-disk template and read how the VM and its data disks are provisioned. Determine how the deployment should initialize and format each disk and assign one drive letter per disk; done means a deployment leaves the data disks ready to use without RDP follow-up.

Written by the indexing model from the issue text.