Improvement Request : Adjust security groups more flexibly

##### ISSUE TYPE
* Improvement Request

##### COMPONENT NAME
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Security Group
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##### CLOUDSTACK VERSION
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4.19.1.2
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##### CONFIGURATION
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Basic or Advanced networking with Security Group
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##### OS / ENVIRONMENT

##### SUMMARY
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We should be able to add, change or delete security group rules while the instance is running.
Sometimes we need to change the security group for some testing or security protection purposes. However, currently, we are unable to switch to another security group rules while the instance is running. As a result, we have no choice but to affect more instance or stop the instance , change the security group, and then start the instance again.
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##### STEPS TO REPRODUCE

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##### EXPECTED RESULTS

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We should be able to add, change or delete security group rules while the instance is running.
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从 Security Group 组件开始，审查 Basic 和 Advanced networking 如何将安全组应用于正在运行的实例。定义在不停止或重启实例的情况下添加、更改和删除规则时的行为。在受支持的配置中，只要这些操作能够在实例保持运行的情况下正常工作，即表示完成。

由索引模型根据 Issue 内容生成。