ZSTAC-86944: honor API VPC agent upgrade

[zstack-robot-2]

Jira

http://jira.zstack.io/browse/ZSTAC-86944

Changes

• Preserve API origin when APIReboot is forwarded as an internal reboot message.
• Treat explicit APIStart and APIReboot like APIReconnect during grayscale upgrade.
• Keep internal and HA lifecycle operations under the existing grayscale gate.
• Add Java unit coverage for API and internal paths.

Verification

• git diff --check passed.
• Tests were not run locally; compile and test only on the development machine.

sync from gitlab !10804

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📥 Commits

Reviewing files that changed from the base of the PR and between 603caaf and 6dd5a9a.

📒 Files selected for processing (4)

• compute/src/main/java/org/zstack/compute/vm/VmInstanceBase.java
• header/src/main/java/org/zstack/header/vm/RebootVmInstanceMsg.java
• plugin/virtualRouterProvider/src/main/java/org/zstack/network/service/virtualrouter/vyos/VyosDeployAgentFlow.java
• test/src/test/java/org/zstack/network/service/virtualrouter/vyos/VyosDeployAgentFlowTest.java

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