Add a "roles" array to user.query

Summary:

• Add "role" information, so clients can identify disabled users.
• Formally deprecate user.info

Test Plan: Ran "user.query" and "user.whoami", inspected output. Verified "user.info" appears as deprecated in method list and console.

Reviewers: csilvers, btrahan

Reviewed By: csilvers

CC: aran

Differential Revision: https://secure.phabricator.com/D2565