kube-ovn vpc没有cidr

kube-ovn中vpc没有cidr，不像传统vpc那样有大网段，关联的subnet cidr可以任意。

kind: Vpc
apiVersion: kubeovn.io/v1
metadata:
  name: vpc0
---
kind: Subnet
apiVersion: kubeovn.io/v1
metadata:
  name: s1
spec:
  vpc: vpc0
  cidrBlock: 10.0.1.0/24
  protocol: IPv4
---
kind: Subnet
apiVersion: kubeovn.io/v1
metadata:
  name: s2
spec:
  vpc: vpc0
  cidrBlock: 1.0.1.0/24
  protocol: IPv4

创建后查看kube-ovn日志，没有报错。