Adjust tests for new return type

vault.delete_policy() and vault.set_policy() both returned None, but
those methods are deprecated. Their replacements return the
requests.Response object instead (204 responses in both cases).

Author: cognifloyd

tests/test_action_delete_policy.py

@@ -1,3 +1,5 @@
+from requests import Response
+
 from delete_policy import VaultPolicyDeleteAction
 from tests.vault_action_tests_base import VaultActionTestCase
 
@@ -12,7 +14,7 @@ def test_method(self):
         # test
         action = self.get_action_instance(config=self.dummy_pack_config)
         action_result = action.run(name="stanley")
-        self.assertIsNone(action_result)
+        self.assertIsInstance(action_result, Response)
 
         result = self.client.get_policy("stanley")
         self.assertIsNone(result)

tests/test_action_set_policy.py

@@ -1,3 +1,5 @@
+from requests import Response
+
 from set_policy import VaultPolicySetAction
 from tests.vault_action_tests_base import VaultActionTestCase
 
@@ -18,7 +20,7 @@ def test_method(self):
             name="stanley",
             rules=rules_text,
         )
-        self.assertIsNone(action_result)
+        self.assertIsInstance(action_result, Response)
 
         result = self.client.get_policy("stanley")
         self.assertEqual(result, rules_text)