Add VMSS support for Guest Configuration (Azure#20245)

* Create new SDK for VMSS

* Add Tests

* Add SDK for VMSS

* Recreate the generated folder

* Regenerate the metadata file

Co-authored-by: Aashish Rajaram Salokhe <aasalokh@microsoft.com>

Author: aashish1987

eng/mgmt/mgmtmetadata/guestconfiguration_resource-manager.txt

@@ -3,12 +3,13 @@ AutoRest installed successfully.
 Commencing code generation
 Generating CSharp code
 Executing AutoRest command
-cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/guestconfiguration/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=C:\data\azure-sdk-for-net\sdk
-2020-07-31 16:45:52 UTC
+cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/guestconfiguration/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --tag=package-2021-01-25 --csharp-sdks-folder=D:\AzSdkNet\azure-sdk-for-net\sdk
+Autorest CSharp Version: 2.3.82
+2021-06-25 17:21:03 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      cfd53fbb24ddb3551abddf6f1096983378e9e1e2
+Commit:      8dff86df71bee429af84ea4713288ef3cdd1db2f
 AutoRest information
 Requested version: v2
-Bootstrapper version:    autorest@2.0.4413
+Bootstrapper version:    autorest@3.2.3

sdk/guestconfiguration/Microsoft.Azure.Management.GuestConfiguration/AzSdk.RP.props

@@ -1,7 +1,7 @@
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <!--This file and it's contents are updated at build time moving or editing might result in build failure. Take due deligence while editing this file-->
   <PropertyGroup>
-    <AzureApiTag>Compute_2018-11-20;GuestConfiguration_2018-11-20;GuestConfiguration_2020-06-25</AzureApiTag>
+    <AzureApiTag>Compute_2018-11-20;GuestConfiguration_2018-11-20;GuestConfiguration_2020-06-25;GuestConfiguration_2021-01-25</AzureApiTag>
     <PackageTags>$(PackageTags);$(CommonTags);$(AzureApiTag);</PackageTags>
   </PropertyGroup>
 </Project>