core: set max_retries to 0 by default (#226)

Author: fioncat

tests/test_unit/test_core/test_client.py

@@ -24,7 +24,6 @@ def client():
             "public_key": "foo",
             "private_key": "foo",
             "timeout": 10,
-            "max_retries": 3,
             "ssl_verify": False,
         }
     )

ucloud/core/client/_cfg.py

@@ -10,7 +10,7 @@ class ConfigSchema(schema.Schema):
         "base_url": fields.Str(default="https://api.ucloud.cn"),
         "user_agent": fields.Str(),
         "timeout": fields.Int(default=30),
-        "max_retries": fields.Int(default=3),
+        "max_retries": fields.Int(default=0),
         "log_level": fields.Int(default=logging.INFO),
         "validate_request": fields.Bool(default=True),
         "ssl_verify": fields.Bool(default=True),