SFP DSL support

FortiExtender 7.2.2 sees the implement of the SFP DSL feature in FortiExtender 311F and 511F.

On these two platforms, the GUI offers an SFP interface that you can edit.

All interfaces can have the SFP feature. When SFP feature is enabled, you will have access to multiple options consecutively. FortiExtender follows the edit feature of the SFP on the interface, depending on user requirement