[#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/writecache/writecachebbolt/generic_test.go

@@ -5,13 +5,13 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/storagetest"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
-	"go.uber.org/zap/zaptest"
+	"go.uber.org/zap"
 )
 
 func TestGeneric(t *testing.T) {
 	storagetest.TestAll(t, func(t *testing.T) storagetest.Component {
 		return New(
-			WithLogger(&logger.Logger{Logger: zaptest.NewLogger(t)}),
+			WithLogger(&logger.Logger{Logger: zap.L()}),
 			WithFlushWorkersCount(2),
 			WithPath(t.TempDir()))
 	})