hybridnet-daemon does not release netlink sockets that watches vxlan dev neighbors and links

[PixelPixel00]

The hybridnet-daemon uses a netlink socket (with the NETLINK_ROUTE family) to monitor the neighbors of created VXLAN devices and the status of other links. However, if an individual watch operation fails (e.g., due to no available socket buffer space), the socket is not closed, and a new socket is created by the daemon to continue monitoring. The kernel may attempt to send related netlink messages to all of these sockets, resulting in significant overhead.