Description of problem:
Config NodeNetworkConfigurationPolicy caused "Internal error occurred" for creating datavolume

Version-Release number of selected component (if applicable):
OCP4.7
Client Version: 4.7.0-202012110053.p0-4ebfe9c
Server Version: 4.7.0-0.nightly-2020-12-14-080124
Kubernetes Version: v1.19.2+e386040
CNV2.6

How reproducible:
Always

Steps to Reproduce:
1. Setup a fresh cluster and make sure the dv could be created normally

2. Config the NNCP
---
apiVersion: nmstate.io/v1alpha1
kind: NodeNetworkConfigurationPolicy
metadata:
  name: br3-nncp
spec:
  desiredState:
    interfaces:
    - name: br3
      type: linux-bridge
      state: up
      bridge:
        options:
          stp:
            enabled: false
        port:
        - name: ens8
      ipv4:
        enabled: false
        dhcp: false
      ipv6:
        enabled: false
  nodeSelector:
    node-role.kubernetes.io/worker: ''

$ oc get nncp
NAME       STATUS
br3-nncp   SuccessfullyConfigured

3. Create the DV

---
apiVersion: cdi.kubevirt.io/v1alpha1
kind: DataVolume
metadata:
  name: import-dv-http
spec:
  source:
    http:
      url: $URL
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 5Gi
    storageClassName: ocs-storagecluster-ceph-rbd
    volumeMode: Block
  contentType: kubevirt


Actual results:
$ oc create -f dv.yaml
Error from server (InternalError): error when creating "dv": Internal error occurred: failed calling webhook "datavolume-mutate.cdi.kubevirt.io": Post "https://cdi-api.openshift-cnv.svc:443/datavolume-mutate?timeout=30s": dial tcp 10.128.2.11:8443: connect: no route to host


Expected results:
DV created normally with NNCP configured 


Additional info:
Sometimes the hco-webhook or hco-operator pod crashed and kept restarting

hco-operator-7d97fcbd65-w6z97                        0/1     CrashLoopBackOff 15

or 

hco-webhook-59cdb8fbc5-47cvk             0/1   CrashLoopBackOff  9  


$ oc logs -p hco-operator-7d97fcbd65-w6z97 -n openshift-cnv 
{"level":"info","ts":1607995346.9719403,"logger":"cmd","msg":"Go Version: go1.14.7"}
{"level":"info","ts":1607995346.971978,"logger":"cmd","msg":"Go OS/Arch: linux/amd64"}
{"level":"info","ts":1607995346.9720407,"logger":"cmd","msg":"Found namespace","Namespace":"openshift-cnv"}
I1215 01:22:28.023021       1 request.go:621] Throttling request took 1.039523169s, request: GET:https://172.30.0.1:443/apis/local.storage.openshift.io/v1alpha1?timeout=32s

$ oc logs -p -n openshift-cnv hco-webhook-59cdb8fbc5-47cvk
{"level":"info","ts":1607944002.9428325,"logger":"cmd","msg":"Go Version: go1.14.7"}
{"level":"info","ts":1607944002.9428897,"logger":"cmd","msg":"Go OS/Arch: linux/amd64"}
{"level":"info","ts":1607944002.9429717,"logger":"cmd","msg":"Found namespace","Namespace":"openshift-cnv"}
I1214 11:06:43.994586       1 request.go:621] Throttling request took 1.03801636s, request: GET:https://172.30.0.1:443/apis/network.openshift.io/v1?timeout=32s


Events:
  Type     Reason        Age                   From                     Message
  ----     ------        ----                  ----                     -------
  Normal   ReconcileHCO  76m (x2839 over 10h)  kubevirt-hyperconverged  HCO Reconcile completed successfully
  Warning  NodeNotReady  71m                   node-controller          Node is not ready
  Normal   Created       70m (x5 over 10h)     kubelet                  Created container hyperconverged-cluster-operator
  Normal   Started       70m (x5 over 10h)     kubelet                  Started container hyperconverged-cluster-operator
  Normal   Pulled        70m (x4 over 72m)     kubelet                  Container image "registry.redhat.io/container-native-virtualization/hyperconverged-cluster-operator@sha256:51a9fc1e24056dd104838944891e830e434ec7052e76cd74f665e2bfc2845c10" already present on machine
  Warning  Unhealthy     49m (x7 over 68m)     kubelet                  Readiness probe failed: Get "http://10.128.2.10:6060/readyz": dial tcp 10.128.2.10:6060: connect: connection refused
  Warning  BackOff       5m1s (x318 over 72m)  kubelet                  Back-off restarting failed container