SLING-3034 - rename modules: api to core

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1519666 13f79535-47bb-0310-9956-ffa450edef68
SLING-3034 - rename modules: healthchecks to support

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1519667 13f79535-47bb-0310-9956-ffa450edef68