Remove admin requirement from MetaMTASendGridReceiveController
Summary:
This got caught in the crossfire when we admin-only'd the whole MetaMTA tool. It
should not be admin only.
(Generally, we should probably separate this out better at some point.)
Test Plan: Hit /mail/sendgrid/ as a logged-out, non-admin user (like SendGrid
does).
Reviewers: s, btrahan
Reviewed By: s
CC: aran, epriestley
Differential Revision: https://secure.phabricator.com/D1588