make PodIP.IP and HostIP.IP required.

Fields used as map keys must be required or defaulted when used in a CRD schema.

see https://github.com/kubernetes/kubernetes/issues/124540

Signed-off-by: Lan Liang <gcslyp@gmail.com>

pkg/generated/openapi/zz_generated.openapi.go

@@ -23024,11 +23024,13 @@ func schema_k8sio_api_core_v1_HostIP(ref common.ReferenceCallback) common.OpenAP
 					"ip": {
 						SchemaProps: spec.SchemaProps{
 							Description: "IP is the IP address assigned to the host",
+							Default:     "",
 							Type:        []string{"string"},
 							Format:      "",
 						},
 					},
 				},
+				Required: []string{"ip"},
 			},
 		},
 	}
@@ -26744,11 +26746,13 @@ func schema_k8sio_api_core_v1_PodIP(ref common.ReferenceCallback) common.OpenAPI
 					"ip": {
 						SchemaProps: spec.SchemaProps{
 							Description: "IP is the IP address assigned to the pod",
+							Default:     "",
 							Type:        []string{"string"},
 							Format:      "",
 						},
 					},
 				},
+				Required: []string{"ip"},
 			},
 		},
 	}