Add objectPHID keys to Harbormaster task schedulers

Summary:
Fixes T9816. It's currently hard to hunt down some particulars in the worker queue if things go awry in Harbormaster.

Supplement the queue with `objectPHID` keys so we can hunt tasks down more easily if the issues in T9816 continue.

Test Plan:
```
mysql> select * from worker_archivetask order by id desc limit 30;
+--------+------------------------------------------------+-----------------------------------+--------------+--------------+--------+--------+----------+-------------+--------------+----------+--------------------------------+
| id     | taskClass                                      | leaseOwner                        | leaseExpires | failureCount | dataID | result | duration | dateCreated | dateModified | priority | objectPHID                     |
+--------+------------------------------------------------+-----------------------------------+--------------+--------------+--------+--------+----------+-------------+--------------+----------+--------------------------------+
| 496024 | HarbormasterTargetWorker                       | 8514:1448232248:Orbital.local:3   |   1448318648 |            0 | 311880 |      0 |   233758 |  1448232248 |   1448232248 |     2000 | PHID-HMBT-thq4oof4byllmbc4q3tt |
| 496023 | PhabricatorApplicationTransactionPublishWorker | 8514:1448232247:Orbital.local:1   |   1448239447 |            0 | 311879 |      0 |    53731 |  1448232247 |   1448232247 |     1000 | PHID-HMBD-i6zo2ltc73rre7o54s7v |
| 496022 | HarbormasterBuildWorker                        | 8514:1448232247:Orbital.local:2   |   1448239447 |            0 | 311878 |      0 |    30736 |  1448232248 |   1448232248 |     2000 | PHID-HMBD-i6zo2ltc73rre7o54s7v |
...
```

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9816

Differential Revision: https://secure.phabricator.com/D14541

src/applications/harbormaster/conduit/HarbormasterSendMessageConduitAPIMethod.php

@@ -256,10 +256,15 @@ final class HarbormasterSendMessageConduitAPIMethod
 
     // If the build has completely paused because all steps are blocked on
     // waiting targets, this will resume it.
+    $build = $build_target->getBuild();
+
     PhabricatorWorker::scheduleTask(
       'HarbormasterBuildWorker',
       array(
-        'buildID' => $build_target->getBuild()->getID(),
+        'buildID' => $build->getID(),
+      ),
+      array(
+        'objectPHID' => $build->getPHID(),
       ));
 
     return null;

src/applications/harbormaster/editor/HarbormasterBuildTransactionEditor.php

@@ -98,6 +98,9 @@ final class HarbormasterBuildTransactionEditor
       'HarbormasterBuildWorker',
       array(
         'buildID' => $build->getID(),
+      ),
+      array(
+        'objectPHID' => $build->getPHID(),
       ));
   }
 

src/applications/harbormaster/engine/HarbormasterBuildEngine.php

@@ -81,6 +81,9 @@ final class HarbormasterBuildEngine extends Phobject {
         'HarbormasterTargetWorker',
         array(
           'targetID' => $target->getID(),
+        ),
+        array(
+          'objectPHID' => $target->getPHID(),
         ));
     }
 

src/applications/harbormaster/storage/HarbormasterBuildable.php

@@ -184,6 +184,9 @@ final class HarbormasterBuildable extends HarbormasterDAO
       'HarbormasterBuildWorker',
       array(
         'buildID' => $build->getID(),
+      ),
+      array(
+        'objectPHID' => $build->getPHID(),
       ));
 
     return $build;