Don't try to start/stop drivers without VMs

It is not supported anyway, and just throws errors.
There is no use to restart or to retry, just give up.

This should never be a problem with "none", though.
That always return running, while generic tests ssh.

pkg/minikube/machine/fix.go

@@ -135,6 +135,15 @@ func recreateIfNeeded(api libmachine.API, cc *config.ClusterConfig, n *config.No
 		}
 	}
 
+	if h.Driver.DriverName() == driver.Generic {
+		if s == state.Running {
+			out.Step(style.Running, `Using the {{.driver_name}} "{{.cluster}}" {{.machine_type}} ...`, out.V{"driver_name": cc.Driver, "cluster": cc.Name, "machine_type": machineType})
+		} else {
+			return h, errors.Errorf("not running")
+		}
+		return h, nil
+	}
+
 	if serr != constants.ErrMachineMissing {
 		klog.Warningf("unexpected machine state, will restart: %v", serr)
 	}

pkg/minikube/machine/stop.go

@@ -55,6 +55,10 @@ func stop(h *host.Host) error {
 		}
 	}
 
+	if h.DriverName == driver.Generic {
+		return nil
+	}
+
 	if err := h.Stop(); err != nil {
 		klog.Infof("stop err: %v", err)
 		st, ok := err.(mcnerror.ErrHostAlreadyInState)