Update check_node_status to support other NodeCondition

[mirshahriar]

Issue: #198

[codecov-io]

Codecov Report

Merging #309 into master will increase coverage by 4.22%.
The diff coverage is 61.11%.

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
+ Coverage    26.8%   31.03%   +4.22%     
==========================================
  Files           7        8       +1     
  Lines         373      435      +62     
==========================================
+ Hits          100      135      +35     
- Misses        262      287      +25     
- Partials       11       13       +2

Impacted Files	Coverage Δ
plugins/check_node_status/lib.go	56.45% <61.11%> (ø)

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