some tweaks on hotfixes

[yliaog]

What type of PR is this?

/kind bug

What this PR does / why we need it:

tweak the hotfix to add the three tests correctly during release

1. kubernetes/test/test_api_client.py
2. kubernetes/test/test_informer.py
3. kubernetes/test/test_metrics.py

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[yliaog]

/assign @roycaihw

[roycaihw]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: roycaihw, yliaog

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