calculate automatic node based symmetry (#9446)

it is possible in many screnarios that even
if the divisible value is optimal, we may
end up with uneven distribution due to number
of nodes present in the configuration.

added code allow for affinity towards various
ellipses to figure out optimal value across
ellipses such that we can always reach a
symmetric value automatically.

Fixes #9416

cmd/admin-handlers_test.go

@@ -117,7 +117,7 @@ func initTestXLObjLayer(ctx context.Context) (ObjectLayer, []string, error) {
 	}
 
 	globalPolicySys = NewPolicySys()
-	objLayer, err := newXLSets(ctx, endpoints, storageDisks, format, 1, 16)
+	objLayer, err := newXLSets(ctx, endpoints, storageDisks, format)
 	if err != nil {
 		return nil, nil, err
 	}