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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從 Security Group 元件開始，檢視 Basic 和 Advanced networking 如何將安全性群組套用至執行中的執行個體。定義在不停止或重新啟動執行個體的情況下新增、變更和刪除規則時的行為。在支援的組態中，只要這些操作能在執行個體持續執行的情況下正常運作，即表示完成。

由索引模型根據 Issue 內容生成。