[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:  undecided
 Version:  0.8.10       |   Keywords:
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 Is there any reason we dont have 'create_master' generate a "master.py"
 instead of "master.cfg" by default?

 We should still continue to tolerate the legacy name, but I think
 promoting something with a py extension makes more sense, especially on
 sample configs and new instances.

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