quick fix tests

[captainroy-hy]

Signed-off-by: Yue Wang seiwy2010@gmail.com

What this PR does / why we need it:

fix tests that may fail after upgrading to k8s 1.21, related to #1985

[codecov]

Codecov Report

Merging #1999 (ade0bcb) into master (9d6aaa6) will increase coverage by 2.39%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1999      +/-   ##
==========================================
+ Coverage   61.59%   63.98%   +2.39%     
==========================================
  Files         158      158              
  Lines       14960    14960              
==========================================
+ Hits         9214     9572     +358     
+ Misses       4771     4422     -349     
+ Partials      975      966       -9     

Flag	Coverage Δ
e2e-rollout-tests	28.84% <ø> (?)
e2etests	38.10% <ø> (+0.15%)	⬆️
unittests	59.28% <ø> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
...ponentdefinition/componentdefinition_controller.go	77.14% <0.00%> (-9.53%)	⬇️
...es/policydefinition/policydefinition_controller.go	71.71% <0.00%> (-5.06%)	⬇️
...g/controller/core.oam.dev/v1alpha2/core/revison.go	50.33% <0.00%> (-2.65%)	⬇️
...ller/core.oam.dev/v1alpha2/application/revision.go	81.55% <0.00%> (-0.49%)	⬇️
...aits/traitdefinition/traitdefinition_controller.go	80.55% <0.00%> (ø)
apis/core.oam.dev/v1beta1/zz_generated.deepcopy.go	41.37% <0.00%> (+0.36%)	⬆️
...oam.dev/v1alpha2/applicationconfiguration/apply.go	66.81% <0.00%> (+0.90%)	⬆️
...ev/v1alpha2/core/scopes/healthscope/healthscope.go	91.41% <0.00%> (+1.01%)	⬆️
pkg/oam/util/helper.go	79.45% <0.00%> (+1.58%)	⬆️
...pplicationcontext/applicationcontext_controller.go	84.48% <0.00%> (+1.72%)	⬆️
... and 19 more

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