graphalytics-tests does not run every time the core compiles

[AlexandruIosup]

In the past month, since Build 51, builds have not run graphalytics-tests, even if their graphalytics-core compiles. Normal behavior (bc -giraph, -neo4j, etc. were not recompiled)? Fix?

Hint: could it be graphalytics-validation (was -tests)? @mihaic with the idea.