crypto: Read OpenSSL config before init

The OpenSSL configuration file allows custom crypto engines but those
directives will not be respected if the config file is loaded after
initializing all crypto subsystems. This patch reads the configuration
file first.

PR-URL: https://github.com/nodejs/node/pull/6374


Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>