Global settings improvements and protect against non-acknowledged changes

##### ISSUE TYPE
* Improvement Request

##### COMPONENT NAME
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UI
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##### CLOUDSTACK VERSION
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4.17.*.*
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##### SUMMARY
This request is for improvements for the "Global settings" screen.
1. As any user with correct privileges, Protect against "reset" button press without acknowledgement.
- On the "Global settings" screen there is no guard on the reset button.
- Clicking the reset button should prompt user. "Are you sure you want to reset "value" to "default value".
- Selecting the "Yes or Ok" button would update the value in the database with the default value.
- The "Cancel" button will close the prompt without changing any values.

2. As "Admin", the UI offers a way to update the default value stored in the database.

3. As "Admin", the UI offers an editable regular expression to test against, and enforce formatting for the value and default value.

4. As "Admin", the UI offers the ability to edit the description.

5. Any changes should be logged with before and after values.

6. As "Admin", the UI offers a way to update the "Category" field value.

グローバル設定画面から開始し、既存のリセットアクションと管理者向けコントロールを追跡します。設定がどのように永続化され、変更がどのように記録されるかを確認し、完了条件を、保護されたリセットに加えて、編集可能なデフォルト値、バリデーション、説明、カテゴリ、および変更前後の監査エントリと定義します。

索引モデルが issue の本文から書いたものです。