How can I get async behavior out of the Fluent SDK?

_From @awesley on June 23, 2017 19:25_

Hiya,

I'm creating VMs using the Fluent SDK. Here's a code snippet:

```
var vm = await this.azure

.VirtualMachines

.Define(vmName)

.WithRegion(region)

.WithExistingResourceGroup(resourceGroupName)

.WithExistingPrimaryNetwork(network)

.WithSubnet(subNetName)

.WithPrimaryPrivateIPAddressDynamic()

.WithoutPrimaryPublicIPAddress()

.WithWindowsCustomImage(image)

.WithAdminUsername(adminUserName)

.WithAdminPassword(adminPassword)

.WithSize(vmSize)

.WithNewStorageAccount(storageAccountName)

.WithTag(TagKeyNames.StorageAccountId, storageAccount.Id)

.CreateAsync();
```

This task does not complete until the machine is entirely provisioned and booting - a period of over ten minutes. That doesn't seem async to me. Is there something I am doing wrong? I want the call to return prior to the machine's availability.

For comparison, when provisioning a VM on Amazon EC2 returns nearly immediately, well before the machine is fully provisioned and booted.

I need from the call is the Id (`vm.Id`), the Primary Private IP (`vm.GetPrimaryNetworkInterface().PrimaryPrivateIP`), and the primary NIC Id (`vm.PrimaryNetworkInterfaceId`). I do not need the machine to be ready.

Thanks!

_Copied from original issue: Azure/azure-sdk-for-net#3411_

首先跟踪 Fluent SDK 的 VM CreateAsync 配置路径，并查看 issue 讨论以了解预期的完成语义。确定请求的 VM ID、主私有 IP 和 NIC ID 是否在机器准备就绪之前可用；完成意味着记录或实现一个符合这些要求的受支持返回点。

由索引模型根据 Issue 内容生成。