pgbouncer: Deal with somerset/prado's instance
Puppetize the pgbouncer instances on prado and somerset. Those nodes have already a pgbouncer instance setup. Only one db is targetted so far, the main db (swh).
Related #1784 (closed) Related T1234
Test Plan
bin/octocatalog ... (prado|somerset): installs a pgbouncer instance bin/octocatalog ... belvedere: nothing changes as expected
Migrated from D1555 (view on Phabricator)