cmd/ctrld: remove prefix main field

While at it, also make init logging with empty log path when running
start command.

Updates #55

cmd/ctrld/cli.go

@@ -207,7 +207,11 @@ func initCLI() {
 				log.Fatalf("failed to unmarshal config: %v", err)
 			}
 
+			logPath := cfg.Service.LogPath
+			cfg.Service.LogPath = ""
 			initLogging()
+			cfg.Service.LogPath = logPath
+
 			processCDFlags()
 			// On Windows, the service will be run as SYSTEM, so if ctrld start as Admin,
 			// the user home dir is different, so pass specific arguments that relevant here.

cmd/ctrld/main.go

@@ -80,7 +80,7 @@ func initLogging() {
 	})
 	writers = append(writers, consoleWriter)
 	multi := zerolog.MultiLevelWriter(writers...)
-	mainLog = mainLog.Output(multi).With().Timestamp().Str("prefix", "main").Logger()
+	mainLog = mainLog.Output(multi).With().Timestamp().Logger()
 	if verbose > 0 || isLog {
 		proxyLog = proxyLog.Output(multi).With().Timestamp().Logger()
 		// TODO: find a better way.