cmd/cli: ignore un-usable interfaces on darwin when resetDNS

cmd/cli/os_linux.go

@@ -119,6 +119,11 @@ func setDNS(iface *net.Interface, nameservers []string) error {
 	return nil
 }
 
+// resetDnsIgnoreUnusableInterface likes resetDNS, but return a nil error if the interface is not usable.
+func resetDnsIgnoreUnusableInterface(iface *net.Interface) error {
+	return resetDNS(iface)
+}
+
 func resetDNS(iface *net.Interface) (err error) {
 	defer func() {
 		if err == nil {