Add hyper-v switch to config set

cmd/minikube/cmd/config/config.go

@@ -149,6 +149,10 @@ var settings = []Setting{
 		validations: []setFn{IsValidAddon},
 		callbacks:   []setFn{EnableOrDisableAddon},
 	},
+	{
+		name: "hyperv-virtual-switch",
+		set:  SetString,
+	},
 }
 
 var ConfigCmd = &cobra.Command{

docs/minikube_config.md

@@ -28,6 +28,7 @@ Configurable fields:
  * heapster
  * ingress
  * awsecr-creds
+ * hyperv-virtual-switch
 
 ```
 minikube config SUBCOMMAND [flags]