[Buildbot] #3318: buildbot.tac do not allow 'print <string>' lines anymore

[Buildbot trac]

#3318: buildbot.tac do not allow 'print <string>' lines anymore
--------------------------+----------------------
Reporter:  yetanotherion  |      Owner:
    Type:  defect         |     Status:  new
Priority:  critical       |  Milestone:  0.9.+
 Version:  0.8.10         |   Keywords:  reconfig
--------------------------+----------------------
 Due to
 https://github.com/buildbot/buildbot/commit/201f0d9cbcffefb4062668c03ca95558f6a6b8c7

 old style
 'print <string>'
 statements in buildbot.tac files

 raise an exception when calling
 % buildbot checkconfig

 which breaks the backward compatibility

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Ticket URL: <http://trac.buildbot.net/ticket/3318>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation