[Buildbot] #3373: Add subject prefixes to BB mailing lists

[Buildbot trac]

#3373: Add subject prefixes to BB mailing lists
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Reporter:  dustin  |      Owner:  dustin
    Type:  task    |     Status:  new
Priority:  major   |  Milestone:  sys - other
 Version:  master  |   Keywords:
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 `[buildbot-devel]` and `[buildbot-users]`

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Ticket URL: <http://trac.buildbot.net/ticket/3373>
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