python 3 updates

- Fix super() calls for python 3
- No need to inherit objects.
- No need for u at the start of strings
- Tidied up some brackets and f-strings too

web/pgadmin/authenticate/mfa/tests/test_mfa.py

@@ -41,7 +41,7 @@ class TestMFATests(BaseTestGenerator):
         if start is not None:
             start(self)
 
-        super(BaseTestGenerator, self).setUp()
+        super().setUp()
 
     def tearDown(self):
 
@@ -50,7 +50,7 @@ class TestMFATests(BaseTestGenerator):
             finish(self)
 
         config.MFA_SUPPORTED_METHODS = []
-        super(BaseTestGenerator, self).tearDown()
+        super().tearDown()
 
     def runTest(self):
         self.check(self)

web/pgadmin/authenticate/mfa/tests/test_mfa_view.py

@@ -50,8 +50,8 @@ def check_validation_view_content(test):
 
                         response = test.tester.get("/mfa/validate")
 
-    test.assertEquals(response.status_code, 200)
-    test.assertEquals(
+    test.assertEqual(response.status_code, 200)
+    test.assertEqual(
         response.headers["Content-Type"], "text/html; charset=utf-8"
     )
     # test.assertTrue('Dummy' in response.data.decode('utf8'))