[#609] Replace zaptest.NewLogger() with zap.L()

Semantic patch:
```
@@
@@
-import "go.uber.org/zap/zaptest"
+import "go.uber.org/zap"

-zaptest.NewLogger(t)
+zap.L()
```

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

pkg/local_object_storage/blobstor/memstore/memstore_test.go

@@ -10,13 +10,13 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	"github.com/stretchr/testify/require"
-	"go.uber.org/zap/zaptest"
+	"go.uber.org/zap"
 )
 
 func TestSimpleLifecycle(t *testing.T) {
 	s := New(
 		WithRootPath("memstore"),
-		WithLogger(&logger.Logger{Logger: zaptest.NewLogger(t)}),
+		WithLogger(&logger.Logger{Logger: zap.L()}),
 	)
 	t.Cleanup(func() { _ = s.Close() })
 	require.NoError(t, s.Open(false))