Update Bloom packaging jobs for releasing 4.7
Update Bloom packaging jobs for releasing 4.7

Also start building packages for focal.  The next release will remove
xenial package builds (if that is not done before).

Change-Id: I99bb03196931df9772286d6b0bf7a7f7f53d3a89

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts