reason: Make vment-helper error driver agnostic

Previously it was used only for vfkit, so we suggested to fallback to
the `nat` network. This advice is not relevant to krunkit or to qemu
(which can also use vmnet-helper).

Change the error to recommend installing vment-helper. We need to think
how we can recommend other networks for vfkit and qemu. Another solution
is to create error for every driver+network combination but this seems
hard to manage.

Author: nirs

pkg/minikube/reason/reason.go

@@ -552,15 +552,11 @@ var (
 	NotFoundVmnetHelper = Kind{
 		ID:       "NOT_FOUND_VMNET_HELPER",
 		ExitCode: ExProgramNotFound,
-		Advice: translate.T(`vmnet-helper was not found on the system, resolve by:
+		Advice: translate.T(`vmnet-helper was not found on the system.
 
-		Option 1) Installing vmnet-helper:
+		Please install vmnet-helper using these instrunctions:
 
-		  https://github.com/nirs/vmnet-helper#installation
-
-		Option 2) Using the nat network:
-
-		  minikube start{{.profile}} --driver vfkit --network nat`),
+		https://github.com/nirs/vmnet-helper#installation`),
 		Style: style.SeeNoEvil,
 	}
 	NotConfiguredVmnetHelper = Kind{