syslog : replace null char by � (#515)

* syslog : replace null char by �
* Update README.md

README.md

@@ -3,8 +3,8 @@
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/dmachard/go-dns-collector)](https://goreportcard.com/report/dmachard/go-dns-collector)
 ![Go version](https://img.shields.io/badge/go%20version-min%201.20-blue)
-![Go tests](https://img.shields.io/badge/go%20tests-348-green)
-![Go lines](https://img.shields.io/badge/go%20lines-49469-red)
+![Go tests](https://img.shields.io/badge/go%20tests-359-green)
+![Go lines](https://img.shields.io/badge/go%20lines-49536-red)
 ![Go Tests](https://github.com/dmachard/go-dns-collector/actions/workflows/testing-go.yml/badge.svg)
 ![Github Actions](https://github.com/dmachard/go-dns-collector/actions/workflows/testing-dnstap.yml/badge.svg)
 ![Github Actions PDNS](https://github.com/dmachard/go-dns-collector/actions/workflows/testing-powerdns.yml/badge.svg)

config.yml

@@ -445,7 +445,7 @@ multiplexer:
 #   # Syslog tag or MSGID
 #   tag: ""
 #   # Replace NULl char in Qname with the specified character
-#   replace-null-char: |
+#   replace-null-char: �
 #   # how many DNS messages will be buffered before being sent
 #   buffer-size: 100
 #   # interval in second before to flush the buffer

docs/loggers/logger_syslog.md

@@ -53,7 +53,7 @@ syslog:
   hostname: ""
   app-name: ""
   tag: ""
-  replace-null-char: "|"
+  replace-null-char: "�"
   flush-interval: 30
   buffer-size: 100
 ```

pkgconfig/loggers.go

@@ -379,7 +379,7 @@ func (c *ConfigLoggers) SetDefault() {
 	c.Syslog.Formatter = "rfc5424"
 	c.Syslog.Hostname = ""
 	c.Syslog.AppName = "DNScollector"
-	c.Syslog.ReplaceNullChar = "|"
+	c.Syslog.ReplaceNullChar = "�"
 	c.Syslog.FlushInterval = 30
 	c.Syslog.BufferSize = 100