AbsPath should be compatible with proxy-prefixes:

- replace Config.Prefix with .Host and .APIPath
- Request .path promoted to .pathPrefix, .baseURL holds required prefix

cmd/libs/go2idl/client-gen/testoutput/testgroup/unversioned/testgroup_client.go

@@ -69,7 +69,7 @@ func setConfigDefaults(config *unversioned.Config) error {
 	if err != nil {
 		return err
 	}
-	config.Prefix = "/apis"
+	config.APIPath = "/apis"
 	if config.UserAgent == "" {
 		config.UserAgent = unversioned.DefaultKubernetesUserAgent()
 	}