Unable to enter maintenace mode periodically

##### ISSUE TYPE

* Bug Report

##### COMPONENT NAME

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Maintenance Mode
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##### CLOUDSTACK VERSION

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4.19.1.0
~~~

##### CONFIGURATION

Advanced Networking
Three KVM Hosts, two of the three hosts run the management servers and database (master/replica).

##### OS / ENVIRONMENT

Ubuntu 22.04

##### SUMMARY

When attempting to put hosts into maintenance mode, some instances migrate, but some still remain on the host until it reaches ErrorInMaintenance. When looking at the agent logs on the host that is being vacated, there appears to be no interaction it receives from the management server during these times when an instance is having issues migrating.

Management Server Log snippet:


##### STEPS TO REPRODUCE

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1. Enter a host into maintenance mode
2. Wait for status to change into a permanent state.
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##### EXPECTED RESULTS

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Host enters into maintenance.
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##### ACTUAL RESULTS

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Host enters into ErrorInMaintenance.
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payload 沒有列出來源檔案或測試；從 Maintenance Mode 工作流程開始，並在所描述的三主機進階網路設定上重現該流程。當執行個體仍留在主機上時，比較 management-server 和 agent 的日誌，並在主機達到 maintenance 而不是 ErrorInMaintenance 時視為工作完成。

由索引模型根據 Issue 內容生成。