Merge pull request #34134 from pims/use-const-key

Replaces fluentd-address string by constant

daemon/logger/fluentd/fluentd.go

@@ -189,7 +189,7 @@ func ValidateLogOpt(cfg map[string]string) error {
 		}
 	}
 
-	_, err := parseAddress(cfg["fluentd-address"])
+	_, err := parseAddress(cfg[addressKey])
 	return err
 }