fail to start if node-label is provided twice with the same key - issue #107

[dbenque]

Fix #107
Draino will exit with error and not fail silently if the same key is provided twice in the node-label parameter that does a AND in case it is provided multiple times.

[codecov]

Codecov Report

Merging #108 (f5f0f45) into master (e0d5277) will increase coverage by 0.36%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   75.21%   75.58%   +0.36%     
==========================================
  Files           7        7              
  Lines         464      471       +7     
==========================================
+ Hits          349      356       +7     
  Misses        101      101              
  Partials       14       14              

Impacted Files	Coverage Δ
internal/kubernetes/nodefilters.go	92.30% <100.00%> (+1.19%)	⬆️

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