Add package discover refresh when component/trait definition are registered

[yangsoon]

fix #1387

refresh package discover when component/trait definition are registered.

• add discover refresh
• add test

[codecov]

Codecov Report

Merging #1402 (f86a9e3) into master (a44257e) will decrease coverage by 0.03%.
The diff coverage is 48.00%.

@@            Coverage Diff             @@
##           master    #1402      +/-   ##
==========================================
- Coverage   51.50%   51.46%   -0.04%     
==========================================
  Files          81       81              
  Lines        8013     8077      +64     
==========================================
+ Hits         4127     4157      +30     
- Misses       3386     3418      +32     
- Partials      500      502       +2     

Flag	Coverage Δ
unittests	51.46% <48.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
pkg/controller/utils/utils.go	22.50% <0.00%> (-5.93%)	⬇️
pkg/oam/util/helper.go	67.19% <ø> (ø)
pkg/controller/utils/capability.go	45.85% <44.00%> (-1.27%)	⬇️
...ponentdefinition/componentdefinition_controller.go	84.37% <100.00%> (+2.23%)	⬆️
...aits/traitdefinition/traitdefinition_controller.go	81.39% <100.00%> (+15.68%)	⬆️
pkg/oam/discoverymapper/mapper.go	66.66% <100.00%> (+4.16%)	⬆️
...ha2/core/components/componentdefinition/handler.go	72.72% <0.00%> (-6.07%)	⬇️
...v1alpha2/appdeployment/appdeployment_controller.go	50.98% <0.00%> (-0.20%)	⬇️
pkg/dsl/model/sets/utils.go	76.05% <0.00%> (+0.29%)	⬆️

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[wonderflow]

LGTM