[autotests] Wrap integration tests in dbus-session-run
Each test needs a dedicated dbus session as the test needs to register services (e.g. kglobalaccel) and might fail if that cannot be registered. Due to the wrapping in another command the test need to make sure that any process they start terminates before them. E.g. the activities test must stop kactivitymanagerd in cleanupTestCase, otherwise the test times out.
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