Add a new distgit role

This is the meat of Dist Git, but it requires quite a few of the roles
previously created.

roles/distgit/files/fedmsg-genacls-config.py

@@ -0,0 +1,4 @@
+config = {
+    'genacls.consumer.enabled': True,
+    'genacls.consumer.delay': 5, # 5 seconds
+}