[Buildbot] #3415: don't output text in tests

[Buildbot trac]

#3415: don't output text in tests
----------------------+-----------------------
Reporter:  rutsky     |      Owner:
    Type:  undecided  |     Status:  new
Priority:  minor      |  Milestone:  undecided
 Version:  master     |   Keywords:
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 Here is what tests outputs for me:

 {{{
 .S.S.S.SS.S.Invalid path to index.html
 .Path to the index.html file is required with option --index-file or -i
 .S.host
 .host
 .host
 .S.SS.S.Twisted version: 15.5.0
 .
 }}}

 (I removed duplicate dots from `trial --reporter=text`, `S` is from
 skipped tests.)

 `host` is from debug output:
 https://github.com/buildbot/buildbot/blob/master/master/buildbot/test/unit/test_status_irc.py#L208

 `Path to the index.html...` and `Invalid path to index.html` are from
 console script:
 https://github.com/buildbot/buildbot/blob/master/master/buildbot/scripts/processwwwindex.py#L40
 its output should be captured in tests and properly checked.

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Ticket URL: <http://trac.buildbot.net/ticket/3415>
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Buildbot: build/test automation