[Sprint 3] Clear log files ahead of new sprint.

[jens-markussen]

partof #8 [T2 - Story] test issue

partof plan4hub/yoda-demo#155 Linking to org issues - testing

In preparation for the new sprint, clear all log files.

Machines

• yoda.com
• skywalk.to.the.max.com
• r2d2.com

estimate 1