Add almanac.queryservices Conduit API method

Summary:
Ref T5833. Just building one query for now which returns the whole binding + interface + network + device tree. Maybe this will get split up in the future.

This will allow web hosts to call the central Almanac and pull instance configuration, authenticating with SSH.

Test Plan:

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: chad, epriestley

Maniphest Tasks: T5833

Differential Revision: https://secure.phabricator.com/D10862