kv: minor refactor of conn_and_client

[asddongmen]

Signed-off-by: dongmen [email protected]

What problem does this PR solve?

Issue Number: ref #10879

What is changed and how it works?

Rename some function and adjust some code structure.

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

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[codecov]

Codecov Report

Attention: Patch coverage is 82.29167% with 17 lines in your changes missing coverage. Please review.

Project coverage is 57.6284%. Comparing base (4f7b74c) to head (83b8bc2).
Report is 2 commits behind head on master.

Additional details and impacted files

Components	Coverage Δ
cdc	61.4428% <82.2916%> (-0.0047%)	⬇️
dm	51.1950% <ø> (-0.0283%)	⬇️
engine	63.3738% <ø> (ø)

Flag	Coverage Δ
unit	57.6284% <82.2916%> (-0.0136%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             master     #11333        +/-   ##
================================================
- Coverage   57.6420%   57.6284%   -0.0136%     
================================================
  Files           849        849                
  Lines        126151     126146         -5     
================================================
- Hits          72716      72696        -20     
- Misses        48039      48049        +10     
- Partials       5396       5401         +5     

[asddongmen]

/retest