[OVN][OSP] After reboot egress node, egress IP cannot be applied anymore.

4.12.0-0.nightly-2022-11-07-181244

Frequently happened in automation. But didn't reproduce it in manual.

1. Label one node as egress node

2.
Config one egressIP object
STEP: Check  one EgressIP assigned in the object.

Nov  8 15:28:23.591: INFO: egressIPStatus: [{"egressIP":"192.168.54.72","node":"huirwang-1108c-pg2mt-worker-0-2fn6q"}]

3.
Reboot the node, wait for the node ready.

EgressIP cannot be applied anymore. Waited more than 1 hour.
 oc get egressip
NAME             EGRESSIPS       ASSIGNED NODE   ASSIGNED EGRESSIPS
egressip-47031   192.168.54.72    

The egressIP should be applied correctly.

Some logs
E1108 07:29:41.849149       1 egressip.go:1635] No assignable nodes found for EgressIP: egressip-47031 and requested IPs: [192.168.54.72]
I1108 07:29:41.849288       1 event.go:285] Event(v1.ObjectReference{Kind:"EgressIP", Namespace:"", Name:"egressip-47031", UID:"", APIVersion:"", ResourceVersion:"", FieldPath:""}): type: 'Warning' reason: 'NoMatchingNodeFound' no assignable nodes for EgressIP: egressip-47031, please tag at least one node with label: k8s.ovn.org/egress-assignable


W1108 07:33:37.401149       1 egressip_healthcheck.go:162] Could not connect to huirwang-1108c-pg2mt-worker-0-2fn6q (10.131.0.2:9107): context deadline exceeded
I1108 07:33:37.401348       1 master.go:1364] Adding or Updating Node "huirwang-1108c-pg2mt-worker-0-2fn6q"
I1108 07:33:37.437465       1 egressip_healthcheck.go:168] Connected to huirwang-1108c-pg2mt-worker-0-2fn6q (10.131.0.2:9107)