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Start ovs-vswitchd with flow-restore-wait
This patch starts ovs-vswitchd with flow-restore-wait set to true and removes the config after restoring necessary flows for the following reasons: 1. It prevents packets from being mishandled by ovs-vswitchd in its default fashion, which could affect existing connections' conntrack state and cause issues like antrea-io#625. 2. It prevents ovs-vswitchd from flushing or expiring previously set datapath flows, so existing connections can achieve 0 downtime during OVS restart. As a result, we remove the config here after restoring necessary flows.
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