Move resource allocation to task queue

Summary: Run the actual resource allocation for Drydock out-of-process via the
task queue.

Test Plan: Ran "drydock_control.php", saw it insert a task and wait for task
completion. Ran "phd debug taskmaster" and saw it run the task.

Reviewers: btrahan, jungejason

Reviewed By: btrahan

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1470

src/__phutil_library_map__.php

@@ -312,6 +312,7 @@ phutil_register_library_map(array(
     'DiffusionSymbolQuery' => 'applications/diffusion/query/symbol',
     'DiffusionView' => 'applications/diffusion/view/base',
     'DrydockAllocator' => 'applications/drydock/allocator/resource',
+    'DrydockAllocatorWorker' => 'applications/drydock/allocator/worker',
     'DrydockBlueprint' => 'applications/drydock/blueprint/base',
     'DrydockCommandInterface' => 'applications/drydock/interface/command/base',
     'DrydockConstants' => 'applications/drydock/constants/base',
@@ -1059,6 +1060,7 @@ phutil_register_library_map(array(
     'DiffusionSvnRequest' => 'DiffusionRequest',
     'DiffusionSymbolController' => 'DiffusionController',
     'DiffusionView' => 'AphrontView',
+    'DrydockAllocatorWorker' => 'PhabricatorWorker',
     'DrydockCommandInterface' => 'DrydockInterface',
     'DrydockController' => 'PhabricatorController',
     'DrydockDAO' => 'PhabricatorLiskDAO',