Ozone uses hadoop as a dependency. The dependency defined on multiple level:
1. the hadoop artifacts are defined in the <dependency> sections
2. both hadoop-ozone and hadoop-hdds projects uses "hadoop-project" as the parent
As we already have a slightly different assembly process it could be more resilient to use a dedicated parent project instead of the hadoop one. With this approach it will be easier to upgrade the versions as we don't need to be careful about the pom contents only about the used dependencies.