update Pax Exam to 3.3.0
update Maven Failsafe Plugin to 2.16
add Maven command for running tests
update sling parent to 18
add more tests for SLING-2998
add more tests for SLING-2998 (add missing dependency)
update org.apache.sling.launchpad.karaf-features and org.apache.sling.launchpad.karaf-integration-tests to 0.1.1-SNAPSHOT
bump versions