CodeGen from PR 16669 in Azure/azure-rest-api-specs

Image Builder 2021-10-01 API (Gen2 Support, Error Schema Fix) (#16669)

* first commit

* first changes for 2021 version

* updated readme.md

* changed systemData path to v1 and removed in CloudError

* renpeng description change

* removed location from ListImageTemplates.json

* removing more locations from examples

* adding back location

* common types resource

* TrackedResource referenced

* added location for listimagetempbyrg.json