Manage kiwi and kiwi-test dependency versions

[sleberknight]

Manage kiwi and kiwi-test dependency versions

Currently when we release retrying-again, kiwi, and kiwi-test it forces us to release all our other libraries in kiwiproject. As long as the updates to these pure utility libraries are 100% backwards compatible, then it should be safe to update them without having to update every other library.

This task is to add a dependencyManagement section to the POM to control the version of these libraries and avoid all the downstream convergence errors. It will allow us to release them on a more frequent cadence, since they are the ones that change more frequently.