Revert "Log fuse errors in the test."

There are lots of benign errors that add noise.

This reverts commit 9a148bfd0246c3603ab580c4adfe548f5bd3e3b9.

samples/in_process.go

@@ -61,7 +61,6 @@ type SampleTest struct {
 // REQUIRES: t.Server has been set.
 func (t *SampleTest) SetUp(ti *ogletest.TestInfo) {
 	cfg := t.MountConfig
-	cfg.ErrorLogger = log.New(os.Stderr, "fuse error: ", log.Flags())
 	if *fDebug {
 		cfg.DebugLogger = log.New(os.Stderr, "fuse: ", 0)
 	}

samples/mount_sample/mount.go

@@ -138,8 +138,7 @@ func main() {
 	}
 
 	cfg := &fuse.MountConfig{
-		ReadOnly:    *fReadOnly,
-		ErrorLogger: log.New(os.Stderr, "fuse error: ", log.Flags()),
+		ReadOnly: *fReadOnly,
 	}
 
 	if *fDebug {