Disable flock tests.

The locking code is not hooked in the fuse/ server code, so this
just exercises the kernel's default locking implementation.

fuse/test/flock_test.go

@@ -14,7 +14,8 @@ import (
 	"testing"
 )
 
-func TestFlock(t *testing.T) {
+// See https://github.com/hanwen/go-fuse/issues/170
+func disabledTestFlock(t *testing.T) {
 	cmd, err := exec.LookPath("flock")
 	if err != nil {
 		t.Skip("flock command not found.")