pd_client: fix the kvproto compatibility

[HuSharp]

Signed-off-by: husharp jinhao.hu@pingcap.com

What is changed and how it works?

Issue Number: Close #14063

What's Changed:

make sure kvproto compatibility

Check List

Tests

• Unit test

Release note

None

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• glorv
• sticnarf

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[glorv]

LGTM

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[sticnarf]

/merge

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This pull request has been accepted and is ready to merge.

Commit hash: 32c232e