[#398] cmd/cli: Add netinfo command to netmap section

Add `netinfo` sub-cmd of `netmap` cmd that read recent information about
NeoFS network. Info is read via NeoFS API NetmapService.NetworkInfo RPC.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-cli/modules/netmap.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 
 	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
 	"github.com/nspcc-dev/neofs-api-go/util/signature"
 	"github.com/nspcc-dev/neofs-node/pkg/services/control"
@@ -36,6 +37,7 @@ func init() {
 		getEpochCmd,
 		localNodeInfoCmd,
 		snapshotCmd,
+		netInfoCmd,
 	)
 
 	localNodeInfoCmd.Flags().BoolVar(&nodeInfoJSON, "json", false, "print node info in JSON format")
@@ -127,6 +129,30 @@ var snapshotCmd = &cobra.Command{
 	},
 }
 
+var netInfoCmd = &cobra.Command{
+	Use:   "netinfo",
+	Short: "Get information about NeoFS network",
+	Long:  "Get information about NeoFS network",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		cli, err := getSDKClient()
+		if err != nil {
+			return err
+		}
+
+		netInfo, err := cli.NetworkInfo(context.Background(), globalCallOptions()...)
+		if err != nil {
+			return fmt.Errorf("rpc error: %w", err)
+		}
+
+		cmd.Printf("Epoch: %d\n", netInfo.CurrentEpoch())
+
+		magic := netInfo.MagicNumber()
+		cmd.Printf("Network magic: [%s] %d\n", netmode.Magic(magic), magic)
+
+		return nil
+	},
+}
+
 func prettyPrintNodeInfo(i *netmap.NodeInfo, jsonEncoding bool) {
 	if jsonEncoding {
 		printJSONMarshaler(i, "node info")