run-java should download testng and jcommander dependencies for java
[`build-formats`](https://github.com/kaitai-io/kaitai_struct_tests/blob/master/build-formats) script includes [`config`](https://github.com/kaitai-io/kaitai_struct_tests/blob/master/config) script that add `testng-6.9.10.jar` and `jcommander-1.48.jar` to java classpath. But there jars can be missed on developer machine and it is not mentioned anywhere that they should be installed. The ideal solution would be to rewrite `run-java` so that these dependencies are downloaded automatically