Fix review comments and new changes in config (#8515)

- Migrate and save only settings which are enabled
- Rename logger_http to logger_webhook and
  logger_http_audit to audit_webhook
- No more pretty printing comments, comment
  is a key=value pair now.
- Avoid quotes on values which do not have space in them
- `state="on"` is implicit for all SetConfigKV unless
  specified explicitly as `state="off"`
- Disabled IAM users should be disabled always

cmd/config/compress/compress.go

@@ -83,6 +83,10 @@ func LookupConfig(kvs config.KVS) (Config, error) {
 	}
 	cfg.Enabled, err = config.ParseBool(compress)
 	if err != nil {
+		// Parsing failures happen due to empty KVS, ignore it.
+		if kvs.Empty() {
+			return cfg, nil
+		}
 		return cfg, err
 	}
 	if !cfg.Enabled {

cmd/config/compress/legacy.go

@@ -30,13 +30,12 @@ const (
 
 // SetCompressionConfig - One time migration code needed, for migrating from older config to new for Compression.
 func SetCompressionConfig(s config.Config, cfg Config) {
+	if !cfg.Enabled {
+		// No need to save disabled settings in new config.
+		return
+	}
 	s[config.CompressionSubSys][config.Default] = config.KVS{
-		config.State: func() string {
-			if cfg.Enabled {
-				return config.StateOn
-			}
-			return config.StateOff
-		}(),
+		config.State:   config.StateOn,
 		config.Comment: "Settings for Compression, after migrating config",
 		Extensions:     strings.Join(cfg.Extensions, config.ValueSeparator),
 		MimeTypes:      strings.Join(cfg.MimeTypes, config.ValueSeparator),