Enable SSL Encryption In API Endpoints

At present there's no option to enable SSL communication to all OpenStack API endpoints. We need an option to enable this for security purposes as per the OpenStack Security Guide:

http://docs.openstack.org/security-guide/content/ch021_paste-and-middleware.html

The option needs to work in both HA and non-HA architectures if possible, which will liklely present some additional challenges when dealing with the load balancing layer.

Note that there appears to be a bug in "keystone-manage ssl_setup" that prevents it from producing a working environment, so this won't be fully automated until that is resolved. The real use case for this is probably groups that want to bring their own certs anyway (e.g. certs signed by a genuine CA). It's also possible to get a working setup with certs you manually generate with OpenSSL. One caveat we will want to document is that this approach requires two puppet runs: one to deploy OpenStack (and keystone along with it), then another after you've installed the SSL certs.