[#622] pkg/innerring: Add multiaddress validator

Add multiaddress validator that calls
`network.VerifyAddress`.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/innerring/processors/netmap/nodevalidation/maddress/calls.go

@@ -0,0 +1,18 @@
+package maddress
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+)
+
+// VerifyAndUpdate calls network.VerifyAddress.
+func (v *Validator) VerifyAndUpdate(n *netmap.NodeInfo) error {
+	err := network.VerifyMultiAddress(n)
+	if err != nil {
+		return fmt.Errorf("could not verify multiaddress: %w", err)
+	}
+
+	return nil
+}

pkg/innerring/processors/netmap/nodevalidation/maddress/validator.go

@@ -0,0 +1,17 @@
+package maddress
+
+// Validator is an utility that verifies node
+// multiaddress.
+//
+// For correct operation, Validator must be created
+// using the constructor (New). After successful creation,
+// the Validator is immediately ready to work through API.
+type Validator struct {}
+
+// New creates a new instance of the Validator.
+//
+// The created Validator does not require additional
+// initialization and is completely ready for work.
+func New() *Validator {
+	return &Validator{}
+}