Description of problem:
After setup cluster with multus disabled, we can enable it by editing the networkconfig, but when the multus is running we cannot remove it by changing the disableMultiNetwork to true.

Version-Release number of selected component (if applicable):
4.0.0-0.nightly-2019-03-06-074438

How reproducible:
always

Steps to Reproduce:
1. Setup cluster with the multus disabled
# cat cluster-netwrok-03-config.yml
---
apiVersion: networkoperator.openshift.io/v1
kind: NetworkConfig
metadata:
  name: cluster
spec:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  defaultNetwork:
    openshiftSDNConfig:
      mode: NetworkPolicy
    type: OpenshiftSDN
  serviceNetwork:
  - 172.30.0.0/16
  disableMultiNetwork: true
status: {}

2. Update the networkconfig to enable the multus
# oc edit networkconfig cluster

3. Check that the multus pods are running well

4. Update the networkconfig again to disable the multus
# oc edit networkconfig cluster

5. Check the multus pods again

Actual results:
The multus will still be running there while the network operator shows that it is disabled.

# oc get cm -n openshift-network-operator applied-cluster -o yaml 
apiVersion: v1
data:
  applied: '{"clusterNetwork":[{"cidr":"10.128.0.0/14","hostPrefix":23}],"serviceNetwork":["172.30.0.0/16"],"defaultNetwork":{"type":"OpenShiftSDN","openshiftSDNConfig":{"mode":"NetworkPolicy","vxlanPort":4789,"mtu":8951}},"disableMultiNetwork":true,"deployKubeProxy":false,"kubeProxyConfig":{"bindAddress":"0.0.0.0","proxyArguments":{"metrics-bind-address":["0.0.0.0:9101"]}}}'
kind: ConfigMap
...

Expected results:
Should be able to disable multus on a running cluster.


Additional info:
Multus service info after change it to disable.

# oc get po,ds -n openshift-multus
NAME               READY   STATUS    RESTARTS   AGE
pod/multus-8g52t   1/1     Running   2          160m
pod/multus-8sc9p   1/1     Running   0          140m
pod/multus-dzwgp   1/1     Running   0          140m
pod/multus-kf8h9   1/1     Running   0          140m
pod/multus-phs9x   1/1     Running   2          160m
pod/multus-xww8p   1/1     Running   2          160m

NAME                          DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                 AGE
daemonset.extensions/multus   6         6         6       6            6           beta.kubernetes.io/os=linux   160m