Status sometimes stops getting set

[jeanbza]

Steps to repro:

1. Set up new tracker project for jenkins using webhooks
2. Using jenkins notification plugin (tried 1.7 and 1.9), set up notification to webhooks
3. Wait a couple of weeks, during which time things work fine
4. Finally, you should see that pulse projects will flash but never change status

e.g., right now a build is red but the pulse project is green, despite having no failures in sending the notification during job and also despite the pulse project flashing while it was running, as expected)

[jeanbza]

Adtl note 1: our really cumbersome workaround is to make another project, generate another webhook, and use this webhook. This buys us a week or two.

Adtl note 2: the webhooks seem to reliably break each time we destroy and re-up our jenkins CI VM. This may be coincidence.