Rename policy capabilities

Summary: Ref T5655. Rename `PhabricatorPolicyCapability` subclasses for consistency.

Test Plan: Browsed a few applications, nothing seemed broken.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin, hach-que

Maniphest Tasks: T5655

Differential Revision: https://secure.phabricator.com/D10037

src/applications/diffusion/ssh/DiffusionSSHWorkflow.php

@@ -118,7 +118,7 @@ abstract class DiffusionSSHWorkflow extends PhabricatorSSHWorkflow {
         $can_push = PhabricatorPolicyFilter::hasCapability(
           $viewer,
           $repository,
-          DiffusionCapabilityPush::CAPABILITY);
+          DiffusionPushCapability::CAPABILITY);
         if (!$can_push) {
           throw new Exception(
             pht('You do not have permission to push to this repository.'));