v1.0.0--The bgp-holdtime function parameter of setting holdtime is added to adjust the holdtime of BGP negotiation with the connected network devices.

In some scenarios, the holdtime of BGP needs to be adjusted.
(1) If you want the BGP neighbor route to disappear as soon as possible after the kube-router goes down, you should set the holdtime to be smaller.
(2) In some scenarios, after the kube-router goes down, the pod network is normal and can still communicate with the outside world. You want BGP neighbor routing to last longer, so in this case you can set the holdtime to be larger.