Make "user role" editing more clear
Summary: The various interfaces here are in conflict about what a role is and isn't. Make them all consistent.
Test Plan: Edited some users into various roles, verified they reported correctly.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T1190
Differential Revision: https://secure.phabricator.com/D2415