Gatling tests must be skipped if skipITs=true

During the release of marketplace-3d, with -DskipTests=true -DskipITs=true, Gatling is still running its tests:

[INFO] --- gatling-maven-plugin:2.1.7:execute (setup) @ gatling ---

The gatling-maven-plugin is not binded on the testing properties. Add to the configuration a skip of the plugin execution mapped on skipITs property.