server: filter the EOF error for normal closed at handshake (#31081)

[ti-srebot]

cherry-pick #31081 to release-5.4
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/33589

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb.git pr/33589:release-5.4-45879b5f1a0c

---

What problem does this PR solve?

Issue Number: close #31063

Problem Summary: loader balance (eg: gcp lb )check health : construct tcp link ok and closed before handshake , tidb will print error log for EOF.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • run tcp client -- remember change the ip/port of tidb
    • tcp client test code was show latter
  • at tidb.log , you will see the EOF at debug level log and see other errors info in error level log
• No code

# `tcp client` test code
#!/usr/bin/env python    
import socket    
    
TCP_IP = '127.0.0.1'    
TCP_PORT = 4000    
BUFFER_SIZE = 1024    
MESSAGE = ""    
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)    
s.connect((TCP_IP, TCP_PORT))    
s.close()

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• jackysp

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[ti-srebot]

/run-all-tests

[ti-srebot]

@knull-cn please accept the invitation then you can push to the cherry-pick pull requests. Comment with /cherry-pick-invite if the invitation is expired.
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[jackysp]

LGTM

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackysp, YangKeao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-14 06:10:53.152883226 +0000 UTC m=+152219.120471273: ☑️ agreed by YangKeao.