This commit implements additional proxy middlewares
- catch_errors - handles errors
- ratelimit - limits incoming requests
- s3token - misddleware for s3auth
- swift3 - implement swift APIs
These middlewares needed to be modeled b/c they
are configurable interfaces that needed to be
configurable via Puppet.
The swift pipeline is commonly used to plug
capabilities in.
This pipeline should be implemented in a way that
is easier to extend as people desire additional
pipelines.
This commit implements classes that can be used
to configure the following pipelines:
- proxy::cache
- proxy::healthcheck
- proxy::keystone
- proxy::swauth
It also reimplements swift::proxy to utilize those
pipelines for configuration.
