Policy - introduce parentQuery and pass around policy configuration from parent to child

Summary: Ref T603. Ref D6941.

Test Plan: Clicked around all over - looked good. I plan to re-test D6941 to make sure the executeOne case works now as intended

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D6944

src/applications/macro/phid/PhabricatorMacroPHIDTypeMacro.php

@@ -22,6 +22,7 @@ final class PhabricatorMacroPHIDTypeMacro extends PhabricatorPHIDType {
 
     return id(new PhabricatorMacroQuery())
       ->setViewer($query->getViewer())
+      ->setParentQuery($query)
       ->withPHIDs($phids)
       ->execute();
   }