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>

api/openapi-spec/swagger.json

@@ -7482,6 +7482,9 @@
           "type": "string"
         }
       },
+      "required": [
+        "ip"
+      ],
       "type": "object"
     },
     "io.k8s.api.core.v1.HostPathVolumeSource": {
@@ -9293,6 +9296,9 @@
           "type": "string"
         }
       },
+      "required": [
+        "ip"
+      ],
       "type": "object"
     },
     "io.k8s.api.core.v1.PodList": {