Remove deprecated comment.

pkg/util/node.go

@@ -26,8 +26,6 @@ import (
 func GetHostname(hostnameOverride string) string {
 	hostname := []byte(hostnameOverride)
 	if string(hostname) == "" {
-		// Note: We use exec here instead of os.Hostname() because we
-		// want the FQDN, and this is the easiest way to get it.
 		fqdn, err := exec.Command("uname", "-n").Output()
 		if err != nil {
 			glog.Fatalf("Couldn't determine hostname: %v", err)