R1:1ebd51aad229

Not include mailing lists in revisions search

Summary: Neither author nor reviewer can be a mailing list.

Test Plan: /differential/filter/revisions/, saw "Type a user name".

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4722