<fix>[kvm]: skip known systemd timeout on reconnect

[ZStack-Robot]

Resolves: ZSTAC-86349

Cherry-pick/backport of bf86016 to 5.4.10.

sync from gitlab !10362

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Reviewing files that changed from the base of the PR and between 08177ca and dc86975.

📒 Files selected for processing (3)

• plugin/kvm/src/main/java/org/zstack/kvm/KVMHost.java
• plugin/kvm/src/main/java/org/zstack/kvm/KVMHostUtils.java
• test/src/test/java/org/zstack/test/kvm/KVMHostUtilsTest.java

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