Handle abort differently from failures

[mrginglymus]

No description provided.

[codecov]

Codecov Report

Merging #64 (1a85823) into master (460f8e1) will increase coverage by 2.72%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #64      +/-   ##
============================================
+ Coverage     83.79%   86.51%   +2.72%     
  Complexity       78       78              
============================================
  Files            14       14              
  Lines           395      408      +13     
  Branches         16       17       +1     
============================================
+ Hits            331      353      +22     
+ Misses           58       49       -9     
  Partials          6        6              

Impacted Files	Coverage Δ	Complexity Δ
...o/jenkins/plugins/checks/steps/WithChecksStep.java	75.90% <100.00%> (+17.33%)	2.00 <0.00> (ø)

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