Use MariaDB in Travis CI and Docker

Description

We are just about to order some new database servers and that is the obvious time to change database release.

This moves Docker and Travis CI to use MariaDB.

DeployedToBeta

Assignee

james_

Reporter

james_

Roadmap

Misc

Priority

Medium

Affects versions

Fix versions

Components

AutomatedTests

Difficulty

Medium

Milestone

Internal 0.9
Configure