R1:6c1b00fa40ce

Rename ACTION_ACCEPT into ACTION_ALLOW

Summary: Ref T603. This is "Allow" in the UI, I just mistyped it when I created the constant.

Test Plan: `grep`

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7296