Use get_parameter_status() method instead of Connection.info.parameter_status() (#3119)

The last one is only available since psycopg 2.8, while the first one since 2.0.8.
For backward compatibility monkeypatch connection object returned by psycopg3.

Close https://github.com/patroni/patroni/issues/3116

tests/__init__.py

@@ -201,20 +201,16 @@ class MockCursor(object):
         pass
 
 
-class MockConnectionInfo(object):
-
-    def parameter_status(self, param_name):
-        if param_name == 'is_superuser':
-            return 'on'
-        return '0'
-
-
 class MockConnect(object):
 
     server_version = 99999
     autocommit = False
     closed = 0
-    info = MockConnectionInfo()
+
+    def get_parameter_status(self, param_name):
+        if param_name == 'is_superuser':
+            return 'on'
+        return '0'
 
     def cursor(self):
         return MockCursor(self)

tests/test_config_generator.py

@@ -3,7 +3,7 @@ import psutil
 import unittest
 import yaml
 
-from . import MockConnect, MockCursor, MockConnectionInfo
+from . import MockConnect, MockCursor
 from copy import deepcopy
 from unittest.mock import MagicMock, Mock, PropertyMock, mock_open as _mock_open, patch
 
@@ -282,7 +282,7 @@ class TestGenerateConfig(unittest.TestCase):
         with patch('sys.argv', ['patroni.py',
                                 '--generate-config', '--dsn', 'host=foo port=bar user=foobar password=pwd_from_dsn']), \
              patch.object(MockCursor, 'rowcount', PropertyMock(return_value=0), create=True), \
-             patch.object(MockConnectionInfo, 'parameter_status', Mock(return_value='off')), \
+             patch.object(MockConnect, 'get_parameter_status', Mock(return_value='off')), \
              self.assertRaises(SystemExit) as e:
             _main()
         self.assertIn('The provided user does not have superuser privilege', e.exception.code)