Add a script for generating CA signed certs, and a client cert.

@filbranden @jbeda Take a look.  @derekwaynecarr is there an easy way to get the IP address on a vagrant cluster?
I'm trying not to require git to do an install right now :/.  

How about we download a tarball from github so we don't need to have git installed?

```
curl -L -J -O https://github.com/brendandburns/easy-rsa/archive/master.tar.gz
tar xzf easy-rsa-master.tar.gz
cd easy-rsa-master/easyrsa3
```