set the ssl_ca_path for fog

Background: The Indexer job was failing this morning due to certificate problems:

```
Indexer failed with Excon::Errors::SocketError: Unable to verify certificate, please set `Excon.defaults[:ssl_ca_path] = path_to_certs`, `Excon.defaults[:ssl_ca_file] = path_to_file`, or `Excon.defaults[:ssl_verify_peer] = false` (less secure).
```

I added this to an initializer and the indexer job is working again. Since it's a different value for each OS, I figured it would be better to put in the production environment only.