ovs: change update strategy to RollingUpdate

[zhangzujian]

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

• Enhancement

How this PR works

When ovs-ovn exits, the shell script checks whether there is a newer daemonset revision(compared to itself). If a newer
revision is found, the ovsdb-server/ovs-vswitchd/ovn-controller created by this pod will not be stopped. Instead, these processes will be stopped later by the pod with a newer revision.

NOTICE
This patch requires the feature gate DaemonSetUpdateSurge.

Feature	Default	Stage	Since	Until
DaemonSetUpdateSurge	false	Alpha	1.21	1.21
DaemonSetUpdateSurge	true	Beta	1.22	1.24
DaemonSetUpdateSurge	true	GA	1.25	-

$ kubectl -n kube-system get po -l app=ovs -o wide -w
NAME            READY   STATUS              RESTARTS   AGE   IP           NODE
ovs-ovn-crk7c   1/1     Running             0          40s   172.18.0.3   kube-ovn-control-plane
ovs-ovn-f4q62   1/1     Running             0          40s   172.18.0.2   kube-ovn-worker
ovs-ovn-gtn6s   0/1     Pending             0          0s    <none>       <none>
ovs-ovn-gtn6s   0/1     Pending             0          0s    <none>       kube-ovn-worker
ovs-ovn-nk9hc   0/1     Pending             0          0s    <none>       <none>
ovs-ovn-nk9hc   0/1     Pending             0          0s    <none>       kube-ovn-control-plane
ovs-ovn-gtn6s   0/1     ContainerCreating   0          0s    172.18.0.2   kube-ovn-worker
ovs-ovn-nk9hc   0/1     ContainerCreating   0          0s    172.18.0.3   kube-ovn-control-plane
ovs-ovn-nk9hc   0/1     Running             0          1s    172.18.0.3   kube-ovn-control-plane
ovs-ovn-gtn6s   0/1     Running             0          2s    172.18.0.2   kube-ovn-worker
ovs-ovn-gtn6s   1/1     Running             0          11s   172.18.0.2   kube-ovn-worker
ovs-ovn-f4q62   1/1     Terminating         0          54s   172.18.0.2   kube-ovn-worker
ovs-ovn-nk9hc   1/1     Running             0          11s   172.18.0.3   kube-ovn-control-plane
ovs-ovn-crk7c   1/1     Terminating         0          54s   172.18.0.3   kube-ovn-control-plane
ovs-ovn-f4q62   0/1     Terminating         0          61s   172.18.0.2   kube-ovn-worker
ovs-ovn-f4q62   0/1     Terminating         0          61s   172.18.0.2   kube-ovn-worker
ovs-ovn-f4q62   0/1     Terminating         0          61s   172.18.0.2   kube-ovn-worker
ovs-ovn-crk7c   0/1     Terminating         0          61s   172.18.0.3   kube-ovn-control-plane
ovs-ovn-crk7c   0/1     Terminating         0          61s   172.18.0.3   kube-ovn-control-plane
ovs-ovn-crk7c   0/1     Terminating         0          61s   172.18.0.3   kube-ovn-control-plane

[oilbeater]

Need to consider how we can upgrade from previous versions