tests/gunicorn_config: Fix tests after recent changes in swh-core

Those tests were broken since rDCORE2255767b9763cefe0841a8d0231f568adcec87ff.

swh/deposit/gunicorn_config.py

-# Copyright (C) 2019  The Software Heritage developers
+# Copyright (C) 2019-2020  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from sentry_sdk.integrations.django import DjangoIntegration
 
-from swh.core.api.gunicorn_config import *  # noqa
-from swh.core.api.gunicorn_config import post_fork as _post_fork
+from swh.core.sentry import init_sentry
 
 
-def post_fork(server, worker):  # type: ignore
-    _post_fork(server, worker,
-               flask=False, sentry_integrations=[DjangoIntegration()])
+def post_fork(server, worker):
+    init_sentry(sentry_dsn=None, integrations=[DjangoIntegration()])

swh/deposit/tests/test_gunicorn_config.py

-# Copyright (C) 2019  The Software Heritage developers
+# Copyright (C) 2019-2020  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
@@ -28,6 +28,7 @@ def test_post_fork_with_dsn_env():
         dsn='test_dsn',
         integrations=[django_integration],
         debug=False,
+        release=None,
     )
 
 
@@ -44,4 +45,5 @@ def test_post_fork_debug():
         dsn='test_dsn',
         integrations=[django_integration],
         debug=True,
+        release=None,
     )