Revert "API: /info: remove BridgeNfIptables, BridgeNfIp6tables fields"

This reverts commit 5d2006256f, which
caused some issues in the docker/cli formatting code that needs some
investigating.

Let's (temporarily) revert this while we look what's wrong.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

integration/system/info_linux_test.go

@@ -3,13 +3,9 @@
 package system // import "github.com/docker/docker/integration/system"
 
 import (
-	"encoding/json"
-	"io"
-	"net/http"
 	"testing"
 
 	"github.com/docker/docker/client"
-	"github.com/docker/docker/testutil/request"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
 )
@@ -51,56 +47,3 @@ func TestInfoBinaryCommits(t *testing.T) {
 		assert.Check(t, is.Equal(info.RuncCommit.Expected, info.RuncCommit.ID)) //nolint:staticcheck // ignore SA1019: field is deprecated, but still used on API < v1.49.
 	})
 }
-
-func TestInfoLegacyFields(t *testing.T) {
-	ctx := setupTest(t)
-
-	const notPresent = "expected field to not be present"
-
-	tests := []struct {
-		name           string
-		url            string
-		expectedFields map[string]any
-	}{
-		{
-			name: "api v1.48 legacy bridge-nftables",
-			url:  "/v1.48/info",
-			expectedFields: map[string]any{
-				"BridgeNfIp6tables": false,
-				"BridgeNfIptables":  false,
-			},
-		},
-		{
-			name: "api v1.49 legacy bridge-nftables",
-			url:  "/v1.49/info",
-			expectedFields: map[string]any{
-				"BridgeNfIp6tables": notPresent,
-				"BridgeNfIptables":  notPresent,
-			},
-		},
-	}
-	for _, tc := range tests {
-		t.Run(tc.name, func(t *testing.T) {
-			res, _, err := request.Get(ctx, tc.url)
-			assert.NilError(t, err)
-			assert.Equal(t, res.StatusCode, http.StatusOK)
-			body, err := io.ReadAll(res.Body)
-			assert.NilError(t, err)
-
-			actual := map[string]any{}
-			err = json.Unmarshal(body, &actual)
-			assert.NilError(t, err, string(body))
-
-			for field, expectedValue := range tc.expectedFields {
-				if expectedValue == notPresent {
-					_, found := actual[field]
-					assert.Assert(t, !found, "field %s should not be present", field)
-				} else {
-					_, found := actual[field]
-					assert.Assert(t, found, "field %s should be present", field)
-					assert.Check(t, is.DeepEqual(actual[field], expectedValue))
-				}
-			}
-		})
-	}
-}