exclude longer running tests in the default maven profile

the current maven build using the default profile takes ~3min on my machine which is IMO way too long.

'mvn clean install' should IMO allow quick turn around cycles during development and finish within a couple of seconds.

requiring the developers to use a custom maven profile dring development (as suggested in OAK-52) is IMO not acceptable. custom profiles are hard to remember when working on different projects.