one-by-one option to Upstream DNS servers

[YBS-PC]

Prerequisites

• I have checked the Wiki and Discussions and found no answer

• I have searched other issues and found no duplicates

• I want to request a feature or enhancement and not ask a question

Description

What problem are you trying to solve?

several upstream servers are used, of which one is a priority server. But this priority server is sometimes disconnected. Therefore, it is advisable to add the "one-by-one" option to Upstream DNS servers settings in addition to the existing ones, , so that the next server is used only if the first DNS request timed out. And every request first of all use first server, and if DNS request timed out then used second server

Proposed solution

one more toggle named "one_by_one"

[ainar-g]

Duplicate of #3701