update to parent version 20

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615714 13f79535-47bb-0310-9956-ffa450edef68
update to parent version 20

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615715 13f79535-47bb-0310-9956-ffa450edef68
update to parent version 20

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615717 13f79535-47bb-0310-9956-ffa450edef68
SLING-3821 add initial version of org.apache.sling.launchpad.karaf-launchpad-integration-tests

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615728 13f79535-47bb-0310-9956-ffa450edef68