SSL on mysql2_makara adapter

[mbackermann]

We've been using Makara with mysql2_makara adapter. The problem is that we need to turn on ssl_mode and pass sslca, sslcert and sslkey to our master and slave connections. Each connection has a different certificate and I couldn't find any docs that explain how we can do it. I already tried passing these parameters under the connection setting, but it didn't work.