Implement automated tests for Additional Software/Offline Mode

To be done before 15th January 2018. (B3)

Blueprint: https://tails.boum.org/blueprint/additional_software_packages_offline_mode/

Feature Branch: feature/14572-automated-tests-for-ASP-offline-mode

Parent Task: #14568 (closed)

Related issues

• Related to #14571 (closed)
• Related to #15799 (closed)
• Blocks #15198 (closed)
• Blocks #14570 (closed)

Original created by @u on 14572 (Redmine)