[ZSTAC-86470] Backport ZSTAC-81450 to 5.4.10

[zstack-robot-2]

Clone Jira: ZSTAC-86470

Original Jira: ZSTAC-81450

Source fix MR: zstack!9041

Cherry-picked commit(s): 5c3fab5

Target branch: 5.4.10

Validation: cherry-pick completed cleanly on 5.4.10. Full regression was not run locally.

sync from gitlab !10336

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• plugin/virtualRouterProvider/src/main/java/org/zstack/network/service/virtualrouter/vyos/VyosConnectFlow.java

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