Don't hang on /status/ for newer Node

Summary: At some point, Node started requiring us to read data before we can get the 'end' event, it seems. Fixes T2953.

Test Plan: Ran server in --foreground mode on node v0.11.0, made request to /status/, got response.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2953

Differential Revision: https://secure.phabricator.com/D5666