Give more priority to the chef custom authentication configs

Configurations priorities of the `pg_hba.conf` are order sensitive.

The following line is added by default though the chef template:

```
local   all             all                                     peer
```

The problem is: I'm trying to add my custom config (below) and the default one is taking the priority (my conf has no effect).

```
local   all             postgres                                trust
```

To make my custom config priorities I changed the config blocks order.