8.0: API Group + v1.24 (#850)

* swagger 1.24

* trim converter

* api group

* before moving method

* grouped api for client

* fix classic build

* fix e2e

* move all code to v8

* fix vis to

* bump ver

* fix authtest filename

src/KubernetesClient.Basic/Autorest/StringTokenProvider.cs

@@ -2,8 +2,6 @@
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
 using System.Net.Http.Headers;
-using System.Threading;
-using System.Threading.Tasks;
 
 namespace k8s.Autorest
 {