(PDB-1798) add jessie to build targets
(PDB-1798) add jessie to build targets

This adds jessie to our build targets. We probably shouldn't merge it until we
get a nightly run with a green cell on jessie.

waynr/puppetdb,senior/puppetdb,grimradical/puppetdb,rbrw/puppetdb,senior/puppetdb,kbarber/puppetdb,mullr/puppetdb,senior/puppetdb,grimradical/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,grimradical/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,senior/puppetdb,mullr/puppetdb,waynr/puppetdb,waynr/puppetdb,rbrw/puppetdb,kbarber/puppetdb,kbarber/puppetdb,grimradical/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,rbrw/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,waynr/puppetdb,rbrw/puppetdb