[BUILD] Run ITs with the correct version of Spark.
[BUILD] Run ITs with the correct version of Spark.

The 2.4 IT runs were running with Spark 2.2.

Also update 2.3 to 2.3.3 since 2.3.2 is not mirrored anymore.

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #157 from vanzin/it-version.

ajbozarth/incubator-livy,ajbozarth/incubator-livy,ajbozarth/incubator-livy,ajbozarth/incubator-livy,ajbozarth/incubator-livy,meisam/incubator-livy,meisam/incubator-livy,meisam/incubator-livy,meisam/incubator-livy,ajbozarth/incubator-livy,meisam/incubator-livy,meisam/incubator-livy