tracing: Support older admin tracing API (#11999)

mc admin trace does not work with older MinIO versions because if an
incompability with older trace admin API. This commit changes madmin for
better backward compatibility with server admin API.

pkg/trace/trace.go

@@ -25,12 +25,12 @@ import (
 type Type int
 
 const (
+	// HTTP tracing (MinIO S3 & Internode)
+	HTTP Type = iota
 	// OS tracing (Golang os package calls)
-	OS Type = iota
+	OS
 	// Storage tracing (MinIO Storage Layer)
 	Storage
-	// HTTP tracing (MinIO S3 & Internode)
-	HTTP
 )
 
 // Info - represents a trace record, additionally