Libcloud tries the paths in the way they are defined and the first bundle which is found is used.

It seems like `/usr/local/etc/openssl/cert.pem` is preferred since it's generated from a key chain, but we should probably still keep path to curl-ca-bundle path there for backward compatibility reasons (not all users might have installed openssl formula, etc.).

We can simply decrease the priority of curl-ca-bundle and move it after the openssl bundle path.