Extend default swift-proxy configuration for Tempest

We are enabling swift middlewares: bulk, catch_errors, ratelimit,
account_quotas, container_quotas, formpost and slo.
Closes-bug: rhbz#1023221

Change-Id: I7474a703601cc06e2de13b1360d377c4b9aefc30
Merge "Extend default swift-proxy configuration for Tempest"