[master] fix DATASRC_DATABASE_FOUND_RRSET for #2563

Discussed via jabber. Show the RRsets as documented instead of the
pointer.

(Note that output may be confusing since there is no delimeter
between the different records in the set. But this is
DBGLVL_TRACE_DETAIL so fine for now.)

src/lib/datasrc/database.cc

@@ -920,7 +920,7 @@ DatabaseClient::Finder::findOnNameResult(const Name& name,
             } else {
                 LOG_DEBUG(logger, DBG_TRACE_DETAILED,
                           DATASRC_DATABASE_FOUND_RRSET).
-                    arg(accessor_->getDBName()).arg(wti->second);
+                    arg(accessor_->getDBName()).arg(*wti->second);
             }
         }
         // Found an RR matching the query, so return it.  (Note that this