Balance java app servers with HAProxy.

cr https://cr.amazon.com/r/2534733/
don't run creates database test if app but no database is configured

cr https://cr.amazon.com/r/2540460/
Add SSL support to Node.js apps.

cr https://cr.amazon.com/r/2545244/
Don't try to install mysql libraries as they are already available.

cr https://cr.amazon.com/r/2554922/