<issue_start><issue_comment>Title: Unable start origin-node with errot  ' Unknown proxy mode "ipvs"  '
username_0: Hello ,I want to change kube-proy mode to "ipvs",config with kubernetes like 
`
KUBE_PROXY_ARGS="--bind-address=10.10.1.8 \
                 --hostname-override=docker4.node \
                 --masquerade-all \
                 --feature-gates=SupportIPVSProxyMode=true \
                 --proxy-mode=ipvs \
                 --ipvs-min-sync-period=5s \
                 --ipvs-sync-period=5s \
                 --ipvs-scheduler=rr \
                 --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig \
                 --cluster-cidr=10.254.0.0/16"
`
but it can`t work with openshift .......


##### Version
`
[root@master ~]# oc version
oc v3.9.0+ba7faec-1
kubernetes v1.9.1+a0ce1bc657
features: Basic-Auth GSSAPI Kerberos SPNEGO

Server https://master:8443
openshift v3.9.0+ba7faec-1
`

##### Steps To Reproduce
1、Edit  /etc/origin/node/node-config.yaml
      Change config about  "proxyArguments":
`
proxyArguments:
  feature-gates:
     - SupportIPVSProxyMode=true
  proxy-mode:
     - ipvs
  ipvs-min-sync-period:
     - 5s
  ipvs-sync-period:
     - 5s
  ipvs-scheduler:
     - rr
`

2、systemctl restart origin-node

`
[root@node2 ~]# systemctl start origin-node
Job for origin-node.service failed because the control process exited with error code. See "systemctl status origin-node.service" and "journalctl -xe" for details.
`


3、logs 
`
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.566576    9436 start_node.go:309] Reading node configuration from /etc/origin/node/node-config.yaml
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.568601    9436 start_node.go:479] Starting node node2 (v3.9.0+ba7faec-1)
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.568898    9436 feature_gate.go:184] feature gates: map[SupportIPVSProxyMode:true]
Nov 13 15:45:28 node2 origin-node[9436]: W1113 15:45:28.568929    9436 server.go:185] WARNING: all flags other than --config, --write-config-to, and --cleanup are deprecated. Please begin using a config file ASAP.
Nov 13 15:45:28 node2 origin-node[9436]: Flag --require-kubeconfig has been deprecated, You no longer need to use --require-kubeconfig. This will be removed in a future version. Providing --kubeconfig enables API server mode, omitting --kubeconfig enables standalone mode unless --require-kubeconfig=true is also set. In the latter case, the legacy default kubeconfig path will be used until --require-kubeconfig is removed.
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.569638    9436 start_node.go:535] kubelet [--address=0.0.0.0 --allow-privileged=true --anonymous-auth=true --authentication-token-webhook=true --authentication-token-webhook-cache-ttl=5m --authorization-mode=Webhook --authorization-webhook-cache-authorized-ttl=5m --authorization-webhook-cache-unauthorized-ttl=5m --cadvisor-port=0 --cgroup-driver=systemd --client-ca-file=/etc/origin/node/ca.crt --cluster-dns=172.16.18.12 --cluster-domain=cluster.local --container-runtime-endpoint=/var/run/dockershim.sock --containerized=false --experimental-dockershim-root-directory=/var/lib/dockershim --file-check-frequency=0s --healthz-bind-address= --healthz-port=0 --host-ipc-sources=api --host-ipc-sources=file --host-network-sources=api --host-network-sources=file --host-pid-sources=api --host-pid-sources=file --hostname-override=node2 --http-check-frequency=0s --image-service-endpoint=/var/run/dockershim.sock --iptables-masquerade-bit=0 --kubeconfig=/etc/origin/node/system:node:node2.kubeconfig --max-pods=250 --network-plugin=cni --node-ip= --node-labels=region=infra --node-labels=zone=default --pod-infra-container-image=openshift/origin-pod:v3.9.0 --pod-manifest-path= --pods-per-core=10 --port=10250 --read-only-port=0 --register-node=true --require-kubeconfig=true --root-dir=/var/lib/origin/openshift.local.volumes --tls-cert-file=/etc/origin/node/server.crt --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 --tls-cipher-suites=TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 --tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 --tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 --tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA --tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA --tls-cipher-suites=TLS_EC
Nov 13 15:45:28 node2 origin-node[9436]: DHE_RSA_WITH_AES_256_CBC_SHA --tls-cipher-suites=TLS_RSA_WITH_AES_128_GCM_SHA256 --tls-cipher-suites=TLS_RSA_WITH_AES_256_GCM_SHA384 --tls-cipher-suites=TLS_RSA_WITH_AES_128_CBC_SHA --tls-cipher-suites=TLS_RSA_WITH_AES_256_CBC_SHA --tls-min-version=VersionTLS12 --tls-private-key-file=/etc/origin/node/server.key]
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.569753    9436 feature_gate.go:220] feature gates: &{{} map[SupportIPVSProxyMode:true]}
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.569815    9436 controller.go:114] kubelet config controller: starting controller
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.569825    9436 controller.go:118] kubelet config controller: validating combination of defaults and flags
Nov 13 15:45:28 node2 origin-node[9436]: I1113 15:45:28.577406    9436 mount_linux.go:210] Detected OS with systemd
Nov 13 15:45:28 node2 origin-node[9436]: F1113 15:45:28.577724    9436 network.go:160] Unknown proxy mode "ipvs"
Nov 13 15:45:28 node2 systemd[1]: origin-node.service: main process exited, code=exited, status=255/n/a
Nov 13 15:45:28 node2 systemd[1]: Failed to start OpenShift Node.
Nov 13 15:45:28 node2 systemd[1]: Unit origin-node.service entered failed state.
Nov 13 15:45:28 node2 systemd[1]: origin-node.service failed.
`
<issue_comment>username_1: Openshift 1.11 version supports ipvs
<issue_comment>username_0: origin  v3.11.0 ？