Allow md5 connections from outside and create connection roles.

Create a superuser role with a given name and password (or change
the postgres role if the name is not given). Also, create an admin
role with the name and the password provided. The admin role has
CREATEDB and CREATEROLE permisssions, effectively making it the
most powerful role after the superuser.

postgres0.yml

@@ -12,6 +12,11 @@ postgresql:
     username: replicator
     password: rep-pass
     network:  127.0.0.1/32
+  superuser:
+    password: zalando
+  admin:
+    username: admin
+    password: admin
   #recovery_conf:
     #restore_command: cp ../wal_archive/%f %p
   parameters: