[Buildbot] #3323: Add "delay" information to builders

[Buildbot trac]

#3323: Add "delay" information to builders
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Reporter:  ben.boeckel  |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  undecided
 Version:  0.8.10       |   Keywords:
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 It would be nice to be able to see how long a build had waited before it
 started on the builder. Similar to the "pending builds" section, but in
 the "finished builds" section.

 I tried getting this information around, but a BuildStatus does not have
 access to the request that created it (maybe I missed some member, but I
 couldn't find a path).

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Ticket URL: <http://trac.buildbot.net/ticket/3323>
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Buildbot: build/test automation