Split unit and integration tests

[ghost]

Current situation
All tests are run as part of the unit testing step (by the surefire plugin), including for example the jetty integration tests.

Desired situation
The unit tests are run as part of the unit testing step (by the surefire plugin) and the integration tests are run as part of the integration testing step (by the failsafe plugin).

Note
Use a purely pragmatic distinction for unit vs integration tests: can a maven install run without any additional (testing) services running.