[IM] bird2 template - set name for syslog

Set a name for syslog to distinguish which instance of bird is logging (e.g. ipv4 or ipv6).

resources/views/api/v4/router/server/bird2/header.foil.php

@@ -49,7 +49,7 @@
 
 
 log "/var/log/bird/<?= $t->handle ?>.log" all;
-log syslog all;
+log syslog name "bird-<?= $t->handle ?>" all;
 
 define routeserverasn     = <?= $t->router->asn ?>;
 define routeserveraddress = <?= $t->router->peering_ip ?>;