Add a script to upgrade PostgreSQL
Add a script to upgrade PostgreSQL

This script will need to change slightly as we change versions of
PostgreSQL

It takes care of changing the mountpoint of our appliance's data
disk from one version to the other, while also upgrading the data
without using extra space and without a dump/restore.

ManageIQ/manageiq-appliance,ManageIQ/manageiq-appliance,ManageIQ/manageiq-appliance