Changed the folder of integration tests to the default value

[gortiz]

Our first iteration on the integration framework used a specific folder under each project to classify tests as unit test or integration tests. It works fine, but IDEs require some configuration to recognized the folder. We have change that to use a more standard approach on which tests are, by default, unit tests, but can be annotated with @Category(IntegrationTest.class*) to indicate they are integration tests and therefore must be ignored by surefire pluging and executed with failsafe plugin

* IntegrationTest.class is on the core module

[gortiz]

I have discarted the approach that uses a category to classify test between unit and integration tests, as it has some problems related to the class not being found by surefire on the same project that is compiling it. Therefore, we have to use class names to classify tests. All classes whose name is Test are unit tests and tests whose name is IT are integration tests.

[codecov-io]

Codecov Report

Merging #163 into devel will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              devel     #163   +/-   ##
=========================================
  Coverage     18.33%   18.33%           
  Complexity     1513     1513           
=========================================
  Files           780      780           
  Lines         26823    26823           
  Branches       2340     2340           
=========================================
  Hits           4917     4917           
  Misses        21572    21572           
  Partials        334      334

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