Steps to reproduce:
1. Start an Opencast instance
2. Build a seperate Opencast
module tests for matterhorn-kernel may fail with for example:
TrustedHttpClientResourceClosingTest.testResourceClosing:61->startServer:71 » Bind
Tests should not be influenced by running instances
For Testing a instance should start with a non standard and free port and use generated names for temporary files.
This happens for example when two instances try to bind to the same port or when two instances write to the same temp file simultaneously.