Add ssl_endpoint definition

Creates Apache vhost with mod_ssl and mod_proxy configurations to
terminate SSL for OpenStack APIs and proxy the plain-text traffic to
localhost.
Add dummy default.rb recipe
Convert library class to module

Mixin to Chef::Recipe
Add ssl_middleware definition

Create SSLMiddleware Python class to be used within Paste pipelines.
This code looks for custom `X-Forwarded-Proto' header (configured in
ssl_endpoint vhost) and modifies the WSGI url_scheme accordingly.