Role + Module for Quarry Labs tool

- Implements
https://meta.wikimedia.org/wiki/Research:Ideas/Public_query_interface_for_Labs
- Deployed via fabric file kept in the source
  repository at analytics/quarry/web
- NAT rules and /etc/hosts for access to labsdb handled
  manually for now
- Uses /srv for everything
- Uses labsdebrepo for python packages

Change-Id: I6042041ffe853095970296c103d3d2e7e19b79e2
Merge "Role + Module for Quarry Labs tool" into production