Remove std log Set Output

The current way to set the std log output generates an io.Writer
but it never closes it so the goleaks detects an anomaly.
The std log shouldn't be used so let's remove it.

cmd/root.go

@@ -7,7 +7,6 @@ import (
  "fmt"
  "io"
  "io/ioutil"
- stdlog "log"
  "os"
  "os/signal"
  "path/filepath"
@@ -242,7 +241,6 @@ func (c *rootCommand) persistentPreRunE(cmd *cobra.Command, args []string) error
  c.loggerIsRemote = true
  }
 
- stdlog.SetOutput(c.globalState.logger.Writer())
  c.globalState.logger.Debugf("k6 version: v%s", consts.FullVersion())
  return nil
 }

cmd/root_test.go

@@ -61,10 +61,7 @@ func TestMain(m *testing.M) {
  }()
 
  defer func() {
- // TODO: figure out why logrus' `Entry.WriterLevel` goroutine sticks
- // around and remove this exception.
- opt := goleak.IgnoreTopFunction("io.(*pipe).read")
- if err := goleak.Find(opt); err != nil {
+ if err := goleak.Find(); err != nil {
  fmt.Println(err) //nolint:forbidigo
  exitCode = 3
  }