<fix>[kvm]: ZSV-9753 disable ip6tables without skipping IPv6

[ZStack-Robot]

Summary

Backport the existing ZSTAC-71202/ZSTAC-71288 fix for ZSV-9753. Split the old skip.ipv6 behavior from ip6tables disabling by introducing bridge.disable.ip6tables and sending disableIp6Tables to kvmagent.

Changes

• Add bridge.disable.ip6tables global property.
• Pass disableIp6Tables during KVM host deploy and security-group cleanup/default-rule commands.
• Update the related regression assertion to check disableIp6Tables.

Testing

• git diff --check
• CI pipeline
• Manual test

Resolves: ZSV-9753

sync from gitlab !10577

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 22b9a3b1-3c7e-4896-86a9-13e4da043750

📥 Commits

Reviewing files that changed from the base of the PR and between a2e49c8 and 9b11f3a.

📒 Files selected for processing (6)

• network/src/main/java/org/zstack/network/l3/NetworkGlobalProperty.java
• plugin/kvm/src/main/java/org/zstack/kvm/KVMAgentCommands.java
• plugin/kvm/src/main/java/org/zstack/kvm/KVMHost.java
• plugin/kvm/src/main/java/org/zstack/kvm/KVMHostDeployArguments.java
• plugin/kvm/src/main/java/org/zstack/kvm/KVMSecurityGroupBackend.java
• test/src/test/groovy/org/zstack/test/integration/kvm/nic/MigrateVmSetDefaultRuleCase.groovy

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/zstackio/codex/ZSV-9753-disable-ip6tables-zsv-5.1.0

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