[Buildbot] #3481: Following doc for WebStatus in 0.8.12 leads to configuration that won't load... incomplete port of plugins from master?

[Buildbot trac]

#3481: Following doc for WebStatus in 0.8.12 leads to configuration that won't
load... incomplete port of plugins from master?
----------------------+-----------------------
Reporter:  dank       |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.12     |   Keywords:
----------------------+-----------------------
 As described in
 https://lists.buildbot.net/pipermail/devel/2015-August/011904.html

 http://docs.buildbot.net/0.8.12/manual/cfg-
 statustargets.html#configuration claims this works:
 {{{
     from buildbot.plugins import status
     c['status'].append(status.WebStatus(8080))
 ```
 But it fails with
 ```
     exceptions.AttributeError: Plugin buildbot.status:WebStatus does not
     implement IStatusReceiver: An object has failed to implement
     interface <InterfaceClass buildbot...IStatusReceiver>
 ```
 The workaround seems to be to ignore the docs and do
 ```
     import buildbot.status.html
     c['status'].append(buildbot.status.html.WebStatus(http_port=8080))
 ```
 Shouldn't either the doc or the code should be fixed so the documented
 sequence works?

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Ticket URL: <http://trac.buildbot.net/ticket/3481>
Buildbot <http://buildbot.net/>
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