SLING-4095 : Clean up code and logging statements

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1633867 13f79535-47bb-0310-9956-ffa450edef68
SLING-4096 : Jobs might stay unprocessed when topology changes

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1633871 13f79535-47bb-0310-9956-ffa450edef68