[kie-issues#839] Reproducible build

[baldimir]

Fixes apache/incubator-kie-issues#839

Changes to make kogito-runtimes build reproducible.

• Upgrades jandex-maven-plugin, so it generates reproducible index files.
• Applies similar fix as in Drools and OptaPlanner to remove timestamp comments from generated text files.
  • drools-util is only added as the exec-maven-plugin dependency, not as a normal dependency.
  • First argument of the RemoveCommentsMain class is to ignore non-existing files. This enables to have one common configuration and not individual configurations in modules.

If you want to have a bit of a laugh, check the comment names :) (please squash before merging, if this gets approved)

[yesamer]

Thank you @baldimir, well done!