orchestration/experiment_output.py: dump formatted JSON

experiments/simbricks/orchestration/experiment/experiment_output.py

@@ -70,7 +70,7 @@ class ExpOutput(object):
     def dump(self, outpath: str) -> None:
         pathlib.Path(outpath).parent.mkdir(parents=True, exist_ok=True)
         with open(outpath, 'w', encoding='utf-8') as file:
-            json.dump(self.__dict__, file)
+            json.dump(self.__dict__, file, sort_keys=True, indent=4)
 
     def load(self, file: str) -> None:
         with open(file, 'r', encoding='utf-8') as fp: