R1:e3f3017b2089

Delete "Risk" field specification from Releeph

Summary: Ref T3718. This is not used and does not seem particularly useful.

Test Plan: Grep.

Reviewers: btrahan

Reviewed By: btrahan

CC: LegNeato, aran

Maniphest Tasks: T3718

Differential Revision: https://secure.phabricator.com/D6755