<fix>[zbs]: skip connected protocol on reconnect

[MatheMatrix]

问题

KVM host 连接/重连时 ExternalPrimaryStorageKvmFactory.deployClient 无条件重部署 PS 暴露的所有协议。即使某协议（如 vhost）已 Connected、SPDK target 在跑，每次 reconnect 都会重 deploy 一次，可能打断在该 host 上运行的 vhost VM。reconnect 是每次 host 连接生命周期都会触发的（手动 ReconnectHost / MN 重启 / 自动重连）。

修复

deploy 前查 ExternalPrimaryStorageHostProtocolRefVO，剔除该 (ps,host) 已 Connected 的协议；全部 Connected 则整体跳过。首连（无 ref 行）不受影响仍全 deploy；部分断开只 deploy 未连协议，与 ping 自愈路径 recoverDisconnectedProtocols 的 due-filter 语义一致。

自测

新增 ZbsVhostVolumeCase.testReconnectSkipsConnectedProtocolDeploy：attach→等 Vhost Connected→清 deploy 计数→ReconnectHost→断言 DEPLOY_VHOST 计数为 0。premium build + test 模块编译通过。

Resolves: ZSTAC-86286

sync from gitlab !10317

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Reviewing files that changed from the base of the PR and between d0d732f and 5f788d3.

📒 Files selected for processing (2)

• plugin/externalStorage/src/main/java/org/zstack/externalStorage/primary/kvm/ExternalPrimaryStorageKvmFactory.java
• test/src/test/groovy/org/zstack/test/integration/storage/primary/addon/zbs/ZbsVhostVolumeCase.groovy

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