Merge pull request #193 in YUNIONIO/onecloud from ~QUXUAN/onecloud:bugfix/qx-storage-cached-image to release/2.1.0

* commit '063a7c1b00c691ff25223ff1d2f3755a4ae9ae5a':
  避免storagecachedimage数据库操作时panic

pkg/compute/models/cachedimages.go

@@ -292,7 +292,7 @@ func (self *SCachedimage) ChooseSourceStoragecacheInRange(hostType string, exclu
 			q = q.Filter(sqlchemy.Equals(host.Field("manager_id"), obj.Id))
 		}
 	}
-	err := q.All(&scimgs)
+	err := db.FetchModelObjects(StoragecachedimageManager, q, &scimgs)
 	if err != nil {
 		return nil, err
 	}