fix record metadata in drs

openstack/drs/v2/replications/results.go

@@ -1,6 +1,8 @@
 package replications
 
 import (
+	"encoding/json"
+
 	"github.com/huaweicloud/golangsdk"
 	"github.com/huaweicloud/golangsdk/pagination"
 )
@@ -53,8 +55,8 @@ type Replication struct {
 	Progress                      string `json:"progress"`
 	FailureDetail                 string `json:"failure_detail"`
 	// RecordMetadata includes volume_type and multiattach currently.
-	RecordMetadata string `json:"record_metadata"`
-	FaultLevel     string `json:"fault_level"`
+	RecordMetadata json.RawMessage `json:"record_metadata"`
+	FaultLevel     string          `json:"fault_level"`
 }
 
 // GetResult contains the body of getting detailed