Add it:test and split ergoTest sbt task (#357)
Add it:test and split ergoTest sbt task (#357)

* add it:test to ergoTest task;
* split ergo tests into two task (run in separate jenkins jobs);
* fix sbt task descriptions;
* fail the sbt task for failed ergo test;
* add publishLocal task as a dependency to ergo*Test tasks;
ScorexFoundation/sigmastate-interpreter,ScorexFoundation/sigmastate-interpreter