Fix compatibility with Chef Client 12.6.0

[legal90]

Fixes #414

[codecov-io]

Codecov Report

Merging #417 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #417   +/-   ##
=======================================
  Coverage   66.86%   66.86%           
=======================================
  Files           7        7           
  Lines         341      341           
=======================================
  Hits          228      228           
  Misses        113      113

Impacted Files	Coverage Δ
libraries/consul_service.rb	57.77% <0%> (ø)	✅

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