State annotations

[eytan-avisror]

Improved the implementation in #24

Node will be annotated with governor.keikoproj.io/state: draining before drain is executed.
Node will be annotated with governor.keikoproj.io/state: termination-issued after termination API is called.

[codecov]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is 60%.

@@           Coverage Diff           @@
##           master      #26   +/-   ##
=======================================
  Coverage   56.48%   56.48%           
=======================================
  Files           4        4           
  Lines         825      825           
=======================================
  Hits          466      466           
  Misses        304      304           
  Partials       55       55

Impacted Files	Coverage Δ
pkg/reaper/nodereaper/nodereaper.go	46.79% <100%> (+0.4%)	⬆️
pkg/reaper/nodereaper/helpers.go	62.18% <53.84%> (-1.07%)	⬇️

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