PostgreSQL connection with SSL

[sapienza88]

To make DB access more secure and the traffic encrypted for PostgreSQL, SSL connections could be useful.
During installation, and using PostgreSQL, Answer should provide the possibility to choose between any of the known SSL modes (after choosing to enable or not SSL at all):

1. require - Always SSL (skip verification)
2. verify-ca - Always SSL (verify that the certificate presented by the server was signed by a trusted CA)
3. verify-full - Always SSL (verify that the certification presented by the server was signed by a trusted CA and the server host name matches the one in the certificate)

The installation interface should then take care of this choice to enable SSL connections over PostgreSQL