[#1062] node/object: Change the sequence of servers

In previous implementation ACL server was the 1st (except metric server
in some cases) server in pipeline of Object service servers. This led to
the fact that errors of this handler could not be reduced to status
responses.

Nest object ACL server into signature and response servers to support
common response format.

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

cmd/neofs-node/object.go

@@ -352,16 +352,6 @@ func initObjectService(c *cfg) {
 		},
 	)
 
-	respSvc := objectService.NewResponseService(
-		splitSvc,
-		c.respSvc,
-	)
-
-	signSvc := objectService.NewSignService(
-		&c.key.PrivateKey,
-		respSvc,
-	)
-
 	aclSvc := acl.New(
 		acl.WithSenderClassifier(
 			acl.NewSenderClassifier(
@@ -373,7 +363,7 @@ func initObjectService(c *cfg) {
 		acl.WithContainerSource(
 			c.cfgObject.cnrSource,
 		),
-		acl.WithNextService(signSvc),
+		acl.WithNextService(splitSvc),
 		acl.WithLocalStorage(ls),
 		acl.WithEACLValidatorOptions(
 			eacl.WithEACLSource(c.cfgObject.eaclSource),
@@ -382,9 +372,19 @@ func initObjectService(c *cfg) {
 		acl.WithNetmapState(c.cfgNetmap.state),
 	)
 
-	var firstSvc objectService.ServiceServer = aclSvc
+	respSvc := objectService.NewResponseService(
+		aclSvc,
+		c.respSvc,
+	)
+
+	signSvc := objectService.NewSignService(
+		&c.key.PrivateKey,
+		respSvc,
+	)
+
+	var firstSvc objectService.ServiceServer = signSvc
 	if c.metricsCollector != nil {
-		firstSvc = objectService.NewMetricCollector(aclSvc, c.metricsCollector)
+		firstSvc = objectService.NewMetricCollector(signSvc, c.metricsCollector)
 	}
 
 	server := objectTransportGRPC.New(firstSvc)