Support new PostgreSQL Database.

[doradojl]

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• What are you trying to do?
  Add support to the new Database module in https://help.sonatype.com/repomanager3/new-database-options/feature-availability-for-postgresql-and-h2-databases

• What feature or behavior is this required for?
  Without this change, we cannot use puppet repositories in the new deployments.

• How could we solve this issue? (Not knowing is okay!)

• Anything else?