[Buildbot] #2889: Check HMAC in github change hook

[Buildbot trac]

#2889: Check HMAC in github change hook
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Reporter:  bgilbert          |       Owner:
    Type:  enhancement       |      Status:  new
Priority:  patches-accepted  |   Milestone:  0.9.+
 Version:  0.8.9             |  Resolution:
Keywords:  github, hook      |
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Comment (by bgilbert):

 !GitHub does still support HTTP authentication for webhooks.  Use a
 payload URL like
 `https://username:password@buildbot.example.com/change_hook/github`.

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Ticket URL: <http://trac.buildbot.net/ticket/2889#comment:5>
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