Don't try to auto-configure network interfaces with no link.

We already start watching for link state changes, so as soon as a link
is established the configuration will be triggered.

src/servers/net/AutoconfigLooper.cpp

@@ -125,8 +125,12 @@ void
 AutoconfigLooper::_ReadyToRun()
 {
 	start_watching_network(B_WATCH_NETWORK_LINK_CHANGES, this);
-	_ConfigureIPv4();
+
-	//_ConfigureIPv6();	// TODO: router advertisement and dhcpv6
+	BNetworkInterface interface(fDevice.String());
+	if (interface.HasLink()) {
+		_ConfigureIPv4();
+		//_ConfigureIPv6();	// TODO: router advertisement and dhcpv6
+	}
 }