[#364] node: Stop flushing big object when termination signal received

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/local_object_storage/blobstor/perf_test.go

@@ -207,7 +207,7 @@ func BenchmarkSubstorageIteratePerf(b *testing.B) {
 				// Benchmark iterate
 				cnt := 0
 				b.ResetTimer()
-				_, err := st.Iterate(common.IteratePrm{
+				_, err := st.Iterate(context.Background(), common.IteratePrm{
 					Handler: func(elem common.IterationElement) error {
 						cnt++
 						return nil