Fix iptables rules

El error:

```zsh
TASK: [ckan-install | Create database tables] ********************************* 
...
...
    connection_factory=connection_factory, async=async)
sqlalchemy.exc.OperationalError: (OperationalError) could not connect to server: Connection refused
	Is the server running on host "192.168.33.10" and accepting
	TCP/IP connections on port 5432?
 None None

FATAL: all hosts have already failed -- aborting
```

Después del fix:

```
TASK: [ckan-install | Create database tables] ********************************* 
changed: [web] => {"changed": true, "cmd": ["/usr/lib/ckan/default/bin/paster", "--plugin=ckan", "db", "init", "-c", "development.ini"], "delta": "0:00:05.596470", "end": "2014-06-17 18:05:56.243656", "rc": 0, "start": "2014-06-17 18:05:50.647186", "stderr": "2014-06-17 18:05:56,086 INFO  [ckan.model] CKAN database version upgraded: 0 -> 71\n2014-06-17 18:05:56,182 INFO  [ckan.model] Database initialised", "stdout": "Initialising DB: SUCCESS"}
```