Annotate terminating nodes

[eytan-avisror]

Fixes #24

This adds an annotate with key governor.keikoproj.io/terminating: "true" prior to issuing a terminate.

[codecov]

Codecov Report

Merging #25 into master will increase coverage by 1.06%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   55.42%   56.48%   +1.06%     
==========================================
  Files           4        4              
  Lines         821      825       +4     
==========================================
+ Hits          455      466      +11     
+ Misses        317      304      -13     
- Partials       49       55       +6

Impacted Files	Coverage Δ
pkg/reaper/nodereaper/nodereaper.go	46.38% <0%> (-0.41%)	⬇️
pkg/reaper/nodereaper/helpers.go	63.24% <0%> (+4.7%)	⬆️

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