Rename autoPromoteActiveServiceDelaySeconds to autoPromotionSeconds

[jessesuen]

Resolves #66

• Rename autoPromoteActiveServiceDelaySeconds to autoPromotionSeconds
• Improve and fix documentation for various fields

[jessesuen]

Other candidate names for this field:

• autoPromotionSeconds
• autoPromotionDelaySeconds
• promotionDelaySeconds

[codecov-io]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #77   +/-   ##
======================================
  Coverage    78.7%   78.7%           
======================================
  Files          15      15           
  Lines        1700    1700           
======================================
  Hits         1338    1338           
  Misses        269     269           
  Partials       93      93

Impacted Files	Coverage Δ
controller/bluegreen.go	80.48% <100%> (ø)	⬆️
controller/pause.go	100% <100%> (ø)	⬆️

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[dthomson25]

LGTM