net/tstun: rename NewFakeTUN to NewFake.

Signed-off-by: David Anderson <danderson@tailscale.com>

net/tstun/fake.go

@@ -16,10 +16,8 @@ type fakeTUN struct {
 	closechan chan struct{}
 }
 
-// NewFakeTUN returns a fake TUN device that does not depend on the
-// operating system or any special permissions.
-// It primarily exists for testing.
-func NewFakeTUN() tun.Device {
+// NewFake returns a tun.Device that does nothing.
+func NewFake() tun.Device {
 	return &fakeTUN{
 		evchan:    make(chan tun.Event),
 		closechan: make(chan struct{}),

net/tstun/wrap_test.go

@@ -132,7 +132,7 @@ func newChannelTUN(logf logger.Logf, secure bool) (*tuntest.ChannelTUN, *TUN) {
 }
 
 func newFakeTUN(logf logger.Logf, secure bool) (*fakeTUN, *TUN) {
-	ftun := NewFakeTUN()
+	ftun := NewFake()
 	tun := WrapTUN(logf, ftun)
 	if secure {
 		setfilter(logf, tun)