use global make_request() directly where we have a custom Resource

Where we want to render a request against a specific Resource, call the global
make_request() function rather than the one in HomeserverTestCase, allowing us
to pass in an appropriate `Site`.

tests/rest/client/v2_alpha/test_account.py

@@ -31,6 +31,7 @@ from synapse.rest.client.v2_alpha import account, register
 from synapse.rest.synapse.client.password_reset import PasswordResetSubmitTokenResource
 
 from tests import unittest
+from tests.server import FakeSite, make_request
 from tests.unittest import override_config
 
 
@@ -255,9 +256,16 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         path = link.replace("https://example.com", "")
 
         # Load the password reset confirmation page
-        request, channel = self.make_request("GET", path, shorthand=False)
+        request, channel = make_request(
+            self.reactor,
+            FakeSite(self.submit_token_resource),
+            "GET",
+            path,
+            shorthand=False,
+        )
         request.render(self.submit_token_resource)
         self.pump()
+
         self.assertEquals(200, channel.code, channel.result)
 
         # Now POST to the same endpoint, mimicking the same behaviour as clicking the
@@ -271,7 +279,9 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
                 form_args.append(arg)
 
         # Confirm the password reset
-        request, channel = self.make_request(
+        request, channel = make_request(
+            self.reactor,
+            FakeSite(self.submit_token_resource),
             "POST",
             path,
             content=urlencode(form_args).encode("utf8"),