br/pdutils: retry when encountered dns error

[YuJuncen]

What problem does this PR solve?

Issue Number: close #53029

Problem Summary:
In a tidb-operator deployed cluster, sometimes coredns responses No such host which will abort the creation of PDController. We should retry this sort of error.

What changed and how does it work?

This PR added retry when the net.Error is DNSError.
Also, this PR increases the retry time limit from 10 times (totally 10s) to 120 times (totally 120s).

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-6.5@727a2c7). Click here to learn what that means.

Additional details and impacted files

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, Leavrth

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-06 06:44:11.077720567 +0000 UTC m=+858004.834856132: ☑️ agreed by BornChanger.
• 2024-05-06 07:17:53.022825179 +0000 UTC m=+860026.779960744: ☑️ agreed by Leavrth.