Validate Aurora Postgres Backend

Validate Aurora Postgres Backend and add it to CI.

If I can rephrase:

Goal

Be able to leverage RDS Aurora to deploy Nuxeo.
The expected gains are:

• reduced AWS cost
• better scalability

MySQL vs PGSQL

When using RDS as a hosted service, there should be no incentive to use a given flavor expect performance.
Since we know that Nuxeo VCS works much better with PGSQL, I am not sure I see the need to evaluate MySQL/Aurora.

Means and technical tasks

• run unit tests against PG Aurora : to validate compatibility
• integrate PG Aurora in the nighly benchmarks : to get a baseline
• run a large scale benchmark against PG Aurora : to validate the scalability