Fix bug in bulk test

in commit 0b11acc I introduced a bug in BulkTest test class.

As this is an integration test, it is not automatically run by maven, and remained unoticed.

This PR reverts the offending commit, and redo it in a proper way.
Also, the test class is not longer @Ignore and it now run by the failsafe maven plugin using mvn verify -DskipITs=false