Add postgresql::hba_addresses_array wrapper

Allows this:
```puppet
postgresql::hba_addresses_array{['192.168.0.1', '192.168.0.2']:
  ensure   => 'present',
  type     => 'hostssl',
  database => 'all',
  user     => 'all',
  method   => 'md5',
}
```
While https://github.com/hercules-team/augeasproviders/issues/45 is not addressed