[Buildbot] #3126: Master config should be named "master.py" by default

[Buildbot trac]

#3126: Master config should be named "master.py" by default
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Reporter:  jaredgrubb   |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  minor        |   Milestone:  0.9.+
 Version:  0.8.10       |  Resolution:
Keywords:               |
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Comment (by sa2ajj):

 Not exactly on-topic, `# vim:ft=python` served me well for years...

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Ticket URL: <http://trac.buildbot.net/ticket/3126#comment:6>
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