interfaces: adjust this for moving it to stable safely

While this should work let's try not to assume how the interface
names look like and just match until the next known delimiter by
excluding it and accepting all other characters.

src/etc/inc/interfaces.lib.inc

@@ -223,7 +223,7 @@ function legacy_interface_stats($ifs = null)
 
     $current_interface = '';
     foreach ($out as $line) {
-        if (preg_match('/^Interface ([a-z0-9-_.:]+) \(([a-z]+[0-9]+)\):$/i', $line, $names)) {
+        if (preg_match('/^Interface ([^\s]+) \(([^\)]+)\):$/i', $line, $names)) {
             $stats[$names[1]] = [
                 'device' => $names[1],
                 'driver' => $names[2],