Recognize 'allocated' as a waiting state in the UI

Summary:
'allocated' is a state between 'pending_allocation' and 'running', and the UI
code should recognize it as indicating a build that is not yet done.
This has the consequence of allowing us to cancel builds stuck in 'allocated'.

Test Plan: None

Reviewers: naphat

Reviewed By: naphat

Subscribers: changesbot, anupc

Tags: #changes_ui

Differential Revision: https://tails.corp.dropbox.com/D225572

webapp/display/changes/build_conditions.js

@@ -61,7 +61,7 @@ export var get_runnable_condition = function(runnable) {
   const status = runnable.status ? runnable.status.id : 'finished';
   var result = runnable.result.id;
 
-  if (status === 'in_progress' || status === 'queued' || status === 'pending_allocation') {
+  if (status === 'in_progress' || status === 'queued' || status === 'pending_allocation' || status == 'allocated') {
     if (runnable.stats && runnable.stats['test_failures']) {
       return COND_WAITING_WITH_ERRORS;
     }