Put the HeraldActionRecord table back on the shelf

Summary:
Fixes T8958. I renamed this class and table (in D13644), but the migration `20150606.mlist.1.php` needs to load records from the table before the table rename applies.

Put the table back and accept a tiny bit of cruft here to fix this problem. We can no-op the migration after a while.

I'll cherry-pick this to `stable`.

Test Plan: Applied migration. Created Herald rules. Reviewed existing Herald rules.

Reviewers: btrahan

Subscribers: epriestley

Maniphest Tasks: T8958

Differential Revision: https://secure.phabricator.com/D13736

resources/sql/autopatches/20150727.heraldaction.1.sql

···
+RENAME TABLE {$NAMESPACE}_herald.herald_actionrecord
+  TO {$NAMESPACE}_herald.herald_action;

src/applications/herald/storage/HeraldActionRecord.php

···
   protected $action;
   protected $target;
 
+  public function getTableName() {
+    // TODO: This class was renamed, but we have a migration which affects the
+    // table prior to to the rename. For now, having cruft here is cleaner than
+    // having it in the migration. We could rename this table again and no-op
+    // the migration after some time. See T8958.
+    return 'herald_action';
+  }
+
   protected function getConfiguration() {
     return array(
       self::CONFIG_SERIALIZATION => array(