Jenkins: add command "wait until jenkins node NODE-NAME is idle"

[brainexe]

No description provided.

[codecov-commenter]

Codecov Report

Merging #275 (ce28541) into master (c7dd5f0) will increase coverage by 0.15%.
The diff coverage is 98.07%.

❗ Current head ce28541 differs from pull request most recent head 1ca75ea. Consider uploading reports for the commit 1ca75ea to get more accurate results

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage   84.86%   85.01%   +0.15%     
==========================================
  Files         113      113              
  Lines        4757     4779      +22     
==========================================
+ Hits         4037     4063      +26     
+ Misses        632      629       -3     
+ Partials       88       87       -1     

Impacted Files	Coverage Δ
command/jenkins/inform_idle.go	91.02% <96.00%> (+2.13%)	⬆️
command/jenkins/nodes.go	100.00% <100.00%> (+7.40%)	⬆️

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