Comparisons with String.indexOf() calls that can be replaced with a c…

[arturobernalg]

…all to the String.contains() method.

[codecov-commenter]

Codecov Report

Merging #242 (e303a4e) into master (f23f67f) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #242      +/-   ##
============================================
+ Coverage     89.02%   89.03%   +0.01%     
- Complexity     3536     3537       +1     
============================================
  Files           183      183              
  Lines          9653     9653              
  Branches       1197     1197              
============================================
+ Hits           8594     8595       +1     
  Misses          777      777              
+ Partials        282      281       -1     

Impacted Files	Coverage Δ
...iguration2/convert/LegacyListDelimiterHandler.java	88.70% <100.00%> (ø)
...s/configuration2/tree/DefaultConfigurationKey.java	90.85% <100.00%> (ø)
...commons/configuration2/tree/InMemoryNodeModel.java	97.27% <0.00%> (+0.38%)	⬆️

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[kinow]

Thank you!