added sdnotify to route-replace codepath #5
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…d even when there are preexisting routes at startup
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This addresses #1. This change allows systemd to get notified even when all routes are pre-existing (such as when restarting the service when run with
-noclean).There may be other opportunities for cleanup in this area (ex: since
Up()/Down()are only called inupdate(), which is already be under a lock, is theatomic.AddInt32()really necessary?)