Refactor Router Logger (#17308)

Make router logger more friendly, show the related function name/file/line.

[BREAKING]
This PR substantially changes the logging format of the router logger. If you use this logging for monitoring e.g. fail2ban you will need to update this to match the new format.

modules/setting/setting.go

@@ -333,13 +333,14 @@ var (
 	LogLevel           log.Level
 	StacktraceLogLevel string
 	LogRootPath        string
-	DisableRouterLog   bool
-	RouterLogLevel     log.Level
-	EnableAccessLog    bool
 	EnableSSHLog       bool
-	AccessLogTemplate  string
 	EnableXORMLog      bool
 
+	DisableRouterLog bool
+
+	EnableAccessLog   bool
+	AccessLogTemplate string
+
 	// Time settings
 	TimeFormat string
 	// UILocation is the location on the UI, so that we can display the time on UI.
@@ -601,7 +602,6 @@ func loadFromConf(allowEmpty bool, extraConfig string) {
 	StacktraceLogLevel = getStacktraceLogLevel(Cfg.Section("log"), "STACKTRACE_LEVEL", "None")
 	LogRootPath = Cfg.Section("log").Key("ROOT_PATH").MustString(path.Join(AppWorkPath, "log"))
 	forcePathSeparator(LogRootPath)
-	RouterLogLevel = log.FromString(Cfg.Section("log").Key("ROUTER_LOG_LEVEL").MustString("Info"))
 
 	sec := Cfg.Section("server")
 	AppName = Cfg.Section("").Key("APP_NAME").MustString("Gitea: Git with a cup of tea")