finalizer: refactoring

[mathetake]

refactored #495

[codecov-io]

Codecov Report

Merging #531 into master will increase coverage by 0.18%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   50.50%   50.69%   +0.18%     
==========================================
  Files          63       63              
  Lines        4940     4902      -38     
==========================================
- Hits         2495     2485      -10     
+ Misses       2035     2005      -30     
- Partials      410      412       +2     

Impacted Files	Coverage Δ
pkg/canary/daemonset_controller.go	59.64% <0.00%> (ø)
pkg/canary/service_controller.go	0.00% <0.00%> (ø)
pkg/canary/status.go	47.85% <0.00%> (ø)
pkg/controller/controller.go	1.33% <0.00%> (ø)
pkg/router/appmesh.go	85.14% <0.00%> (ø)
pkg/router/contour.go	88.19% <0.00%> (ø)
pkg/router/gloo.go	70.00% <0.00%> (ø)
pkg/router/ingress.go	53.54% <0.00%> (ø)
pkg/router/kubernetes_noop.go	0.00% <0.00%> (ø)
pkg/router/nop.go	0.00% <0.00%> (ø)
... and 5 more

---

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[stefanprodan]

LGTM

Thanks @mathetake