pt-galera-log-explainer: fix debug log formatting mismatch

"extrator" log was not using the same output format as the rest
beacuse it was initialized before main()

src/go/pt-galera-log-explainer/internal.go

@@ -12,13 +12,14 @@ import (
 	"github.com/percona/percona-toolkit/src/go/pt-galera-log-explainer/types"
 	"github.com/percona/percona-toolkit/src/go/pt-galera-log-explainer/utils"
 	"github.com/pkg/errors"
+	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 )
 
-var logger = log.With().Str("component", "extractor").Logger()
+var logger zerolog.Logger
-
-func init() {
 
+func initComponentLogger() {
+	logger = log.With().Str("component", "extractor").Logger()
 	if CLI.Since != nil {
 		logger = logger.With().Time("since", *CLI.Since).Logger()
 	}

src/go/pt-galera-log-explainer/main.go

@@ -62,6 +62,7 @@ func main() {
 	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
 	zerolog.SetGlobalLevel(zerolog.InfoLevel)
 	log.Logger = zerolog.New(zerolog.ConsoleWriter{Out: os.Stderr, NoColor: CLI.NoColor, FormatTimestamp: func(_ interface{}) string { return "" }})
+	initComponentLogger()
 	if CLI.Verbosity == types.Debug {
 		zerolog.SetGlobalLevel(zerolog.DebugLevel)
 	}