[#537] Upgrade NeoFS SDK Go with changed netmap package

`PlacementPolicy` type now provides methods to work with QL-encoded
policies. System network parameters can be read using dedicated method
without iterating. Applications can work with `PlacementPolicy`
variables directly so there is no need to use pointers.

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

api/handler/api.go

@@ -24,7 +24,7 @@ type (
 
 	// Config contains data which handler needs to keep.
 	Config struct {
-		DefaultPolicy      *netmap.PlacementPolicy
+		DefaultPolicy      netmap.PlacementPolicy
 		DefaultMaxAge      int
 		NotificatorEnabled bool
 	}

api/handler/put.go

@@ -623,16 +623,18 @@ func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	useDefaultPolicy := true
 	if createParams.LocationConstraint != "" {
 		for _, placementPolicy := range policies {
 			if placementPolicy.LocationConstraint == createParams.LocationConstraint {
 				p.Policy = placementPolicy.Policy
 				p.LocationConstraint = createParams.LocationConstraint
+				useDefaultPolicy = false
 				break
 			}
 		}
 	}
-	if p.Policy == nil {
+	if useDefaultPolicy {
 		p.Policy = h.cfg.DefaultPolicy
 	}
 

api/layer/container.go

@@ -145,7 +145,7 @@ func (n *layer) createContainer(ctx context.Context, p *CreateBucketParams) (*da
 
 	idCnr, err := n.neoFS.CreateContainer(ctx, PrmContainerCreate{
 		Creator:              bktInfo.Owner,
-		Policy:               *p.Policy,
+		Policy:               p.Policy,
 		Name:                 p.Name,
 		SessionToken:         p.SessionToken,
 		AdditionalAttributes: attributes,

api/layer/layer.go

@@ -136,7 +136,7 @@ type (
 	// CreateBucketParams stores bucket create request parameters.
 	CreateBucketParams struct {
 		Name               string
-		Policy             *netmap.PlacementPolicy
+		Policy             netmap.PlacementPolicy
 		EACL               *eacl.Table
 		SessionToken       *session.Container
 		LocationConstraint string