koordlet: revise nri server start

[saintube]

Ⅰ. Describe what this PR does

koordlet: revise nri server starting, check if nri.sock exists before new the server.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@04c5ba8). Click here to learn what that means.
Patch coverage: 83.87% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1578   +/-   ##
=======================================
  Coverage        ?   65.18%           
=======================================
  Files           ?      352           
  Lines           ?    36353           
  Branches        ?        0           
=======================================
  Hits            ?    23698           
  Misses          ?    10911           
  Partials        ?     1744           

Flag	Coverage Δ
unittests	65.18% <83.87%> (?)

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

Files Changed	Coverage Δ
pkg/koordlet/runtimehooks/runtimehooks.go	70.47% <80.00%> (ø)
pkg/koordlet/runtimehooks/nri/server.go	61.06% <84.00%> (ø)
pkg/koordlet/util/system/util_test_tool.go	51.70% <100.00%> (ø)

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[saintube]

/cc @kangclzjc

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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• pkg/koordlet/OWNERS [hormes]

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