This uses our standard buildpack, but each module must get a custom .blazar.yaml to pass in required
properties to the build. One can distribute that .blazar.yaml using build-scripts/copy_blazar_yaml.sh.
In order to minimize the duplication, most of the customizations are consolidated in
build-scripts/prepare_environment.sh.
The RPM build is hooked into the standard build hbase-assembly, as a post-build step. The RPM build
scripts in hbase-assembly/rpm-build handle turning the assembled tar.gz into multiple RPMs. We required
some minor changes to the descriptor in hbase-assembly to account for the fact that our build processes
each module independently instead of as a single reactor build. As a result, moduleSet does not work, so
moduleSet usages were converted to dependencySet.
