infra/patchwork: systemd files and production.py settings

* systemd/patchwork-delivery*: on demand socket to take mail in a localhost
  TCP socket, to allow patchwork to be in a separate container from
  email.
* production.py: patchwork.settings.production file.
* pass.py: example pass.py file
diff --git a/infra/patchwork/pass.py b/infra/patchwork/pass.py
new file mode 100644
index 0000000..6514232
--- /dev/null
+++ b/infra/patchwork/pass.py
@@ -0,0 +1,4 @@
+# example pass file
+SECRET_KEY = "aaaaaaaaaaaaaaaaaa"
+EMAIL_HOST_PASSWORD = os.getenv('EMAIL_HOST_PASSWORD', '')
+DATABASES['default']['PASSWORD'] = os.environ.get('DATABASE_PASSWORD', 'bbbbbbbbbbbbbbbbbbbbb');