template 201-vm-specialized-vhd-existing-vnet conflict

During deployment I get a message:

`"error": {
"code": "ResourceDeploymentFailure",
"message": "The resource operation completed with terminal provisioning state 'Failed'.",
"details": [
{
"code": "VMMarketplaceInvalidInput",
"message": "Creating a virtual machine from Marketplace image requires Plan information in the request. OS disk name is ...`

Start with the template named template 201-vm-specialized-vhd-existing-vnet and reproduce the reported deployment error, focusing on the VMMarketplaceInvalidInput message and its requirement for Marketplace image plan information. Done means the template deploys successfully without that terminal provisioning failure.

Written by the indexing model from the issue text.