tidb-lightning: tidb.pd-addr supports multiple addresses

[hfxsd]

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[LGTM Timeline notifier]

Timeline:

• 2024-01-15 04:31:24.475060423 +0000 UTC m=+157526.039358113: ☑️ agreed by lance6716.
• 2024-01-17 02:33:00.241169177 +0000 UTC m=+323221.805466883: ☑️ agreed by ran-huang.

[hfxsd]

/approve

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[Frank945946]

LGTM