add utf-8 charset to multipart-manifest=get resp

Change-Id: Ic06e8b07a4db4ccde633f3b56a49f198cdd467cb

swift/proxy/controllers/obj.py

@@ -520,6 +520,7 @@ class ObjectController(Controller):
                 'X-Copy-From' not in req.headers and \
                 self.app.allow_static_large_object:
             resp.content_type = 'application/json'
+            resp.charset = 'utf-8'
 
         if config_true_value(resp.headers.get('x-static-large-object')) and \
                 req.params.get('multipart-manifest') != 'get' and \

test/unit/proxy/test_server.py

@@ -1274,6 +1274,7 @@ class TestObjectController(unittest.TestCase):
             self.assertEqual(resp.status_int, 200)
             self.assertEqual(resp.body, json_listing)
             self.assertEqual(resp.content_type, 'application/json')
+            self.assertEqual(resp.charset.lower(), 'utf-8')
 
             self.assertEqual(
                 requested,