[Buildbot] #3021: Add a "version added" information for various modules

[Buildbot trac]

#3021: Add a "version added" information for various modules
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Reporter:  sa2ajj  |      Owner:
    Type:  task    |     Status:  new
Priority:  major   |  Milestone:  0.9.+
 Version:  master  |   Keywords:  docs
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 A user
 [http://irclogs.jackgrigg.com/irc.freenode.net/buildbot/2014-11-11#i_3493182
 today] was wondering about Gerrit source step.

 He uses buildbot 0.8.6p1 and it looks like this particular feature was
 added in 0.8.9.

 If we had a "Version Added" information that would save him some hassle.

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Ticket URL: <http://trac.buildbot.net/ticket/3021>
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