bird2 template - set name for syslog - was PR #909

[barryo]

This is a useful idea from @listerr via #909 - opening issue as PR closed via head repo deletion.

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


  log "/var/log/bird/<?= $t->handle ?>.log" all;
- log syslog all;
+ log syslog name "bird-<?= $t->handle ?>" all;