improve coverage of new service module

[rndmh3ro]

No description provided.

[codecov]

Codecov Report

Merging #51 into master will increase coverage by 0.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   92.30%   93.14%   +0.83%     
==========================================
  Files          15       15              
  Lines         455      452       -3     
  Branches       45       45              
==========================================
+ Hits          420      421       +1     
+ Misses         14       10       -4     
  Partials       21       21              

Impacted Files	Coverage Δ
plugins/modules/icinga_service_apply.py	94.73% <ø> (ø)
plugins/modules/icinga_service.py	92.85% <100.00%> (+6.41%)	⬆️

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