[FLOC-1030] Generate tutorial box with omnibus packages.

https://clusterhq.atlassian.net/browse/FLOC-1030

This needs to be merged along with its sibling issues.

Also, buildbot needs to be adjusted so that the omnibus rather than native package build triggers the tutorial builder.
It can, and the published version will be. But it is more straightforward to make each build upload to different path.