Update the hasPrivilege and hasAllPrivileges so that they use debug logging
rather than error logging for the audit-type messages that they produce.  This
will significantly reduce the cost of these methods (which is important, since
hasPrivilege is called at least once per operation), since there is a global
debugEnabled() check that can be used to avoid a lot of the expensive work if
debugging isn't needed.

OpenDS Issue Number:  1386