[#189] sdk/netmap: Refactor Replica type

Replace alias to v2 type Replica with v2-compatible implementation.

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

pkg/netmap/replica.go

@@ -0,0 +1,47 @@
+package netmap
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
+)
+
+// Replica represents v2-compatible object replica descriptor.
+type Replica netmap.Replica
+
+// NewReplica creates and returns new Replica instance.
+func NewReplica() *Replica {
+	return NewReplicaFromV2(new(netmap.Replica))
+}
+
+// NewReplicaFromV2 converts v2 Replica to Replica.
+func NewReplicaFromV2(f *netmap.Replica) *Replica {
+	return (*Replica)(f)
+}
+
+// ToV2 converts Replica to v2 Replica.
+func (r *Replica) ToV2() *netmap.Replica {
+	return (*netmap.Replica)(r)
+}
+
+// Count returns number of object replicas.
+func (r *Replica) Count() uint32 {
+	return (*netmap.Replica)(r).
+		GetCount()
+}
+
+// SetCount sets number of object replicas.
+func (r *Replica) SetCount(c uint32) {
+	(*netmap.Replica)(r).
+		SetCount(c)
+}
+
+// Selector returns name of selector bucket to put replicas.
+func (r *Replica) Selector() string {
+	return (*netmap.Replica)(r).
+		GetSelector()
+}
+
+// SetSelector sets name of selector bucket to put replicas.
+func (r *Replica) SetSelector(s string) {
+	(*netmap.Replica)(r).
+		SetSelector(s)
+}