Remove ovn4nfv support (#8265)

README.md

@@ -145,7 +145,6 @@ Note: Upstart/SysV init based OS types are not supported.
   - [kube-ovn](https://github.com/alauda/kube-ovn) v1.8.1
   - [kube-router](https://github.com/cloudnativelabs/kube-router) v1.3.2
   - [multus](https://github.com/intel/multus-cni) v3.8
-  - [ovn4nfv](https://github.com/opnfv/ovn4nfv-k8s-plugin) v1.1.0
   - [weave](https://github.com/weaveworks/weave) v2.8.1
 - Application
   - [cephfs-provisioner](https://github.com/kubernetes-incubator/external-storage) v2.1.0-k8s1.11
@@ -195,8 +194,6 @@ You can choose between 10 network plugins. (default: `calico`, except Vagrant us
 
 - [cilium](http://docs.cilium.io/en/latest/): layer 3/4 networking (as well as layer 7 to protect and secure application protocols), supports dynamic insertion of BPF bytecode into the Linux kernel to implement security services, networking and visibility logic.
 
-- [ovn4nfv](docs/ovn4nfv.md): [ovn4nfv-k8s-plugins](https://github.com/opnfv/ovn4nfv-k8s-plugin) is the network controller, OVS agent and CNI server to offer basic SFC and OVN overlay networking.
-
 - [weave](docs/weave.md): Weave is a lightweight container overlay network that doesn't require an external K/V database cluster.
     (Please refer to `weave` [troubleshooting documentation](https://www.weave.works/docs/net/latest/troubleshooting/)).