[FIX] Fix psql install and gpg keys retreival.
- Psql 9.6 start was failing because it was removed from the base imabe since we will install the customer version that is in the vars file: https://github.com/Vauxoo/docker-odoo-image/commit/c29ca5db96e40e6e82debc71ecaaaea98770a739
- Added another 2 addresses to download the gpg keys, if one failt it should fallback to another. Hopefuly won't fail the 3