Add Inner Ring code

pkg/services/object_manager/replication/garbage.go

@@ -0,0 +1,27 @@
+package replication
+
+import (
+	"sync"
+)
+
+type (
+	garbageStore struct {
+		*sync.RWMutex
+		items []Address
+	}
+)
+
+func (s *garbageStore) put(addr Address) {
+	s.Lock()
+	defer s.Unlock()
+
+	for i := range s.items {
+		if s.items[i].Equal(&addr) {
+			return
+		}
+	}
+
+	s.items = append(s.items, addr)
+}
+
+func newGarbageStore() *garbageStore { return &garbageStore{RWMutex: new(sync.RWMutex)} }