<fix>[network]: skip non kvm vxlan attach

[MatheMatrix]

Summary

Fix DPU baremetal VXLAN NIC hotplug failure caused by the KVM VXLAN attach-resource extension sending KVM agent messages to a non-KVM host.

Changes

• Skip KVMRealizeL2VxlanNetworkBackend.instantiateResourceOnAttachingNic() when the target host hypervisor is not KVM.
• Keep existing KVM VXLAN realization behavior unchanged for KVM hosts.

Testing

• mvn -pl plugin/vxlan -DskipTests compile

Related DPU agent MR: http://dev.zstack.io:9080/zstackio/zstack-bm2-dpu-agent/-/merge_requests/9

Resolves: ZCF-0

sync from gitlab !10020

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: http://open.zstack.ai:20001/code-reviews/zstack-cloud.yaml (via .coderabbit.yaml)

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📥 Commits

Reviewing files that changed from the base of the PR and between a621cf2 and 57876c9.

📒 Files selected for processing (1)

• plugin/vxlan/src/main/java/org/zstack/network/l2/vxlan/vxlanNetworkPool/KVMRealizeL2VxlanNetworkBackend.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/yingzhe.hu/fix/dpu-vxlan-hotplug-skip-kvm-realize-5.5.22

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