Summary:
Ref T2785
Looks for hosts in `conduit.servers` config and if any exist route any conduit calls through any one of the hosts.
Test Plan:
Make some curl calls to public methods (`conduit.ping`), watch the access log for two requests. Make some calls from the UI that require authentication, watch the access log a bit more.
Also ran the unit tests.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2785
Differential Revision: https://secure.phabricator.com/D5970
