Update config template files to Icehouse

The most important change is in the middleware pipeline for the proxy:
  - gatekeeper, container_sync and dlo are added:
    - gatekeeper got added to filter headers.
    - container_sync is a new middleware related to configuration of
      container sync. We could add a config file for container_sync
      (container-sync-realms.conf) but we didn't have any config for
      that before, so we should be fine.
    - dlo simply got split (like slo before)
  - tempurl is moved before slo and dlo, as suggested by the doc.
Merge pull request #256 from vuntz/icehouse-conf

Update config template files to Icehouse