KNL-1135 config from security.properties is marked as secured

git-svn-id: https://source.sakaiproject.org/svn/kernel@133373 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1135 updated logging for secured keys

git-svn-id: https://source.sakaiproject.org/svn/kernel@133374 66ffb92e-73f9-0310-93c1-f5514f145a0a