Raise log level of VM Class to VM request mapper func

These logs are not worth the noise, especially for classes that
aren't being used by any VMs in the namespace.

controllers/virtualmachine/virtualmachine/virtualmachine_controller.go

@@ -194,7 +194,9 @@ func classToVMMapperFn(
 			}
 		}
 
-		logger.Info("Returning VM reconcile requests due to VirtualMachineClass watch", "requests", reconcileRequests)
+		if len(reconcileRequests) > 0 {
+			logger.V(4).Info("Returning VM reconcile requests due to VirtualMachineClass watch", "requests", reconcileRequests)
+		}
 		return reconcileRequests
 	}
 }