Enhanced console logging

Introduce new environment variables:
  * MQ_LOGGING_CONSOLE_SOURCE
  * MQ_LOGGING_CONSOLE_FORMAT
  * MQ_LOGGING_CONSOLE_EXCLUDE_ID

Authored-by: Avinash Ganesh <avinash.v.g@in.ibm.com> and BHAVYA K R <bhavkris@in.ibm.com>

cmd/runmqdevserver/main.go

@@ -1,5 +1,5 @@
 /*
-© Copyright IBM Corporation 2018, 2021
+© Copyright IBM Corporation 2018, 2023
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"strings"
 	"syscall"
 
 	"github.com/ibm-messaging/mq-container/internal/htpasswd"
@@ -30,7 +31,20 @@ import (
 var log *logger.Logger
 
 func getLogFormat() string {
-	return os.Getenv("LOG_FORMAT")
+	logFormat := strings.ToLower(strings.TrimSpace(os.Getenv("MQ_LOGGING_CONSOLE_FORMAT")))
+	//old-style env var is used.
+	if logFormat == "" {
+		logFormat = strings.ToLower(strings.TrimSpace(os.Getenv("LOG_FORMAT")))
+	}
+
+	if logFormat != "" && (logFormat == "basic" || logFormat == "json") {
+		return logFormat
+	} else {
+		//this is the case where value is either empty string or set to something other than "basic"/"json"
+		logFormat = "basic"
+	}
+
+	return logFormat
 }
 
 func getDebug() bool {