Crypto's Random needs to be reset after forks, otherwise it exceptions

conf/gunicorn_registry.py

@@ -1,6 +1,13 @@
+from Crypto import Random
+
 bind = 'unix:/tmp/gunicorn_registry.sock'
 workers = 8
 worker_class = 'gevent'
 logconfig = 'conf/logging.conf'
 pythonpath = '.'
 preload_app = True
+
+def post_fork(server, worker):
+  # Reset the Random library to ensure it won't raise the "PID check failed." error after
+  # gunicorn forks.
+  Random.atfork()