fix ovs-ovn startup/restart #2467
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What type of this PR
Which issue(s) this PR fixes:
As we have changed the ovs update strategy to RollingUpdate in #2422, we should not restart ovs by deleting pods. Instead, we should use
kubectl rollout restart ds/ovs-ovn.While restarting ovs-vswitchd, the ovs shell scripts automatically save/restore the flows. We should remove this action from
start-ovs.sh.