Vagrantfile: run the Travis tests after setup
This allows using vagrant up command to validate a LISA change, including full installation from a bare Ubuntu system.
GitLab Maintenance scheduled for Thursday, 18th December 2025, from 7:00 AM to 10:00 AM BST. GitLab will be in read-only mode and experience short periods of complete downtime (up to 20 minutes) during this window.
This allows using vagrant up command to validate a LISA change, including full installation from a bare Ubuntu system.