Add Inner Ring code

pkg/morph/client/netmap/new_epoch.go

@@ -0,0 +1,23 @@
+package netmap
+
+import "github.com/pkg/errors"
+
+// NewEpochArgs groups the arguments
+// of new epoch invocation call.
+type NewEpochArgs struct {
+	number int64 // new epoch number
+}
+
+// SetEpochNumber sets the new epoch number.
+func (a *NewEpochArgs) SetEpochNumber(v int64) {
+	a.number = v
+}
+
+// NewEpoch invokes the call of new epoch method
+// of NeoFS Netmap contract.
+func (c *Client) NewEpoch(args NewEpochArgs) error {
+	return errors.Wrapf(c.client.Invoke(
+		c.addPeerMethod,
+		args.number,
+	), "could not invoke method (%s)", c.newEpochMethod)
+}