koord-scheduler: compatible with Kubernetes v1.18 ~ v1.20

[eahydra]

Signed-off-by: Joseph joseph.t.lee@outlook.com

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

fix #310

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

Merging #315 (b87bdc7) into main (6e097f9) will increase coverage by 0.08%.
The diff coverage is 80.43%.

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
+ Coverage   62.60%   62.69%   +0.08%     
==========================================
  Files         103      104       +1     
  Lines        9620     9666      +46     
==========================================
+ Hits         6023     6060      +37     
- Misses       3093     3099       +6     
- Partials      504      507       +3     

Flag	Coverage Δ
unittests	62.69% <80.43%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
.../plugins/compatibledefaultpreemption/preemption.go	80.43% <80.43%> (ø)

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[eahydra]

/hold

[eahydra]

/hold cancel

[jasonliu747]

/lgtm

[saintube]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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