[#460] services/object: Reduce distibutedTarget memory footprint

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/services/object/put/distributed.go

@@ -25,8 +25,6 @@ type preparedObjectTarget interface {
 type distributedTarget struct {
 	traversal traversal
 
-	remotePool, localPool util.WorkerPool
-
 	obj     *objectSDK.Object
 	objMeta object.ContentMeta
 
@@ -34,7 +32,7 @@ type distributedTarget struct {
 
 	nodeTargetInitializer func(nodeDesc) preparedObjectTarget
 
-	isLocalKey func([]byte) bool
+	getWorkerPool func([]byte) (util.WorkerPool, bool)
 
 	relay func(context.Context, nodeDesc) error
 
@@ -223,13 +221,8 @@ func (t *distributedTarget) iterateAddresses(ctx context.Context, traverser *pla
 		wg.Add(1)
 
 		addr := addrs[i]
-		isLocal := t.isLocalKey(addr.PublicKey())
-
-		workerPool := t.remotePool
-		if isLocal {
-			workerPool = t.localPool
-		}
 
+		workerPool, isLocal := t.getWorkerPool(addr.PublicKey())
 		if err := workerPool.Submit(func() {
 			defer wg.Done()