[flaky CI] [nns] NNS LastSuccessfulUpdateTime when network configuration hasn't change should not be updated

[qinqon]

What happened:
https://prow.apps.ovirt.org/view/gcs/kubevirt-prow/pr-logs/pull/nmstate_kubernetes-nmstate/661/pull-kubernetes-nmstate-e2e-handler-k8s/1341025954180370432

[nns] NNS LastSuccessfulUpdateTime when network configuration hasn't change should not be updated expand_less | 15s
-- | --
/tmp/knmstate/kubernetes-nmstate/test/e2e/handler/nns_update_timestamp_test.go:29 Failed after 0.006s. Expected     <string>: NodeNetworkStateStatus to match fields: { .CurrentState: 	Expected 	    <string>: "...on: fd10:24..." 	to equal               \| 	    <string>: "...on: fe80::/..." .LastSuccessfulUpdateTime: 	Expected 	    <v1.Time>: { 	        Time: 2020-12-21T14:32:38Z, 	    } 	to equal 	    <v1.Time>: { 	        Time: 2020-12-21T14:32:33Z, 	    } }

/kind bug
/triage build-watcher

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• NodeNetworkState on affected nodes (use kubectl get nodenetworkstate <node_name> -o yaml):
• Problematic NodeNetworkConfigurationPolicy:
• kubernetes-nmstate image (use kubectl get pods --all-namespaces -l app=kubernetes-nmstate -o jsonpath='{.items[0].spec.containers[0].image}'):
• NetworkManager version (use nmcli --version)
• Kubernetes version (use kubectl version):
• OS (e.g. from /etc/os-release):
• Others:

[qinqon]

/kind bug
/triage build-watcher

[nelsonspbr]

Again: https://prow.apps.ovirt.org/view/gcs/kubevirt-prow/pr-logs/pull/nmstate_kubernetes-nmstate/692/pull-kubernetes-nmstate-e2e-handler-k8s-future/1356945962311880705

[qinqon]

The diff on states
#688

-  - destination: fd10:244::bac0/122
-    metric: 1024
-    next-hop-address: fd00::103
-    next-hop-interface: eth0
-    table-id: 254
   - destination: fe80::/64
     metric: 100
     next-hop-address: ""
     next-hop-interface: eth0
     table-id: 254
   - destination: ff00::/8
     metric: 256
     next-hop-address: ""
     next-hop-interface: eth0
     table-id: 255

[xpivarc]

Again https://prow.apps.ovirt.org/view/gcs/kubevirt-prow/pr-logs/pull/nmstate_kubernetes-nmstate/688/pull-kubernetes-nmstate-e2e-handler-k8s/1358701024306532352
https://prow.apps.ovirt.org/view/gcs/kubevirt-prow/pr-logs/pull/nmstate_kubernetes-nmstate/692/pull-kubernetes-nmstate-e2e-handler-k8s-future/1356945962311880705
https://prow.apps.ovirt.org/view/gcs/kubevirt-prow/pr-logs/pull/nmstate_kubernetes-nmstate/688/pull-kubernetes-nmstate-e2e-handler-k8s-future/1358701024314920960