[#1441] services/tree: Use grpc.WaitForReady option when creating client

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

pkg/services/tree/cache.go

@@ -103,6 +103,7 @@ func (c *clientCache) dialTreeService(ctx context.Context, netmapAddr string) (*
 			tracing.NewStreamClientInterceptor(),
 		),
 		grpc.WithContextDialer(c.ds.GrpcContextDialer()),
+		grpc.WithDefaultCallOptions(grpc.WaitForReady(true)),
 	}
 
 	if !netAddr.IsTLSEnabled() {

pkg/services/tree/sync.go

@@ -342,7 +342,9 @@ func (*Service) createConnection(a network.Address) (*grpc.ClientConn, error) {
 			metrics.NewStreamClientInterceptor(),
 			tracing_grpc.NewStreamClientInterceptor(),
 		),
-		grpc.WithTransportCredentials(insecure.NewCredentials()))
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithDefaultCallOptions(grpc.WaitForReady(true)),
+	)
 }
 
 // ErrAlreadySyncing is returned when a service synchronization has already