[Logging] Reduce logging at informational level.

At the info level, we still get the reference, course and section.  From the reference, we can look up any other attributes on the user at Core.  Likewise, we can see a bit of the user's context in the case of SLE.  For CA, only the reference really matters.  If we need to debug issues accessing certain courses, we can change the LOG_LEVEL or just ensure that the proper relationships are set at Core.