Merge pull request #5640 from dcbw/cni-plugin-pod-uid

sandbox: send pod UID to CNI plugins as K8S_POD_UID

pkg/cri/server/sandbox_run.go

@@ -409,6 +409,7 @@ func toCNILabels(id string, config *runtime.PodSandboxConfig) map[string]string
 		"K8S_POD_NAMESPACE":          config.GetMetadata().GetNamespace(),
 		"K8S_POD_NAME":               config.GetMetadata().GetName(),
 		"K8S_POD_INFRA_CONTAINER_ID": id,
+		"K8S_POD_UID":                config.GetMetadata().GetUid(),
 		"IgnoreUnknown":              "1",
 	}
 }