Use some more human-readable Conduit keys in updated API methods

Summary:
Ref T12074. This uses more consistent Conduit keys for constraint names.

This is a minor compatibility break on watchers/members but since these methods are more useful now this is probably a good time to try to get away with it, and a more consistent API is better in the long run. I need to issue compatibility guidance for the milestones thing anyway and that one isn't avoidable, so try to rip the bandage off all in one go.

Test Plan: Reviewed new constraint names from console, called methods using them.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12074

Differential Revision: https://secure.phabricator.com/D17161

src/applications/project/query/PhabricatorProjectColumnSearchEngine.php

@@ -20,6 +20,7 @@ final class PhabricatorProjectColumnSearchEngine
       id(new PhabricatorPHIDsSearchField())
         ->setLabel(pht('Projects'))
         ->setKey('projectPHIDs')
+        ->setConduitKey('projects')
         ->setAliases(array('project', 'projects', 'projectPHID')),
     );
   }

src/applications/project/query/PhabricatorProjectSearchEngine.php

@@ -24,10 +24,12 @@ final class PhabricatorProjectSearchEngine
       id(new PhabricatorUsersSearchField())
         ->setLabel(pht('Members'))
         ->setKey('memberPHIDs')
+        ->setConduitKey('members')
         ->setAliases(array('member', 'members')),
       id(new PhabricatorUsersSearchField())
         ->setLabel(pht('Watchers'))
         ->setKey('watcherPHIDs')
+        ->setConduitKey('watchers')
         ->setAliases(array('watcher', 'watchers')),
       id(new PhabricatorSearchSelectField())
         ->setLabel(pht('Status'))
@@ -55,11 +57,13 @@ final class PhabricatorProjectSearchEngine
       id(new PhabricatorPHIDsSearchField())
         ->setLabel(pht('Parent Projects'))
         ->setKey('parentPHIDs')
+        ->setConduitKey('parents')
         ->setAliases(array('parent', 'parents', 'parentPHID'))
         ->setDescription(pht('Find direct subprojects of specified parents.')),
       id(new PhabricatorPHIDsSearchField())
         ->setLabel(pht('Ancestor Projects'))
         ->setKey('ancestorPHIDs')
+        ->setConduitKey('ancestors')
         ->setAliases(array('ancestor', 'ancestors', 'ancestorPHID'))
         ->setDescription(
           pht('Find all subprojects beneath specified ancestors.')),