[#895] test: Use zaptest logger

Previous implementation mixes logs from different tests, now logs
are separeted by test.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/util/logger/test/logger.go

@@ -4,21 +4,16 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
-	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"go.uber.org/zap/zaptest"
 )
 
 // NewLogger creates a new logger.
 func NewLogger(t testing.TB) *logger.Logger {
-	cfg := zap.NewDevelopmentConfig()
-	cfg.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
-
-	log, err := cfg.Build()
-	require.NoError(t, err, "could not prepare logger")
-
 	var l logger.Logger
-	l.Logger = log
-
+	l.Logger = zaptest.NewLogger(t,
+		zaptest.Level(zapcore.DebugLevel),
+		zaptest.WrapOptions(zap.Development(), zap.AddCaller()))
 	return &l
 }