KNL-1027 Eliminate the use of covers in kernel services
This leaves in a couple of uses of ComponentManager where it was not quite possible to remove it without serious changes.
Patch from Unicon



git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@122028 66ffb92e-73f9-0310-93c1-f5514f145a0a