[Buildbot] #3405: Use AppVeyor for testing Buildbot on Windows on GitHub

[Buildbot trac]

#3405: Use AppVeyor for testing Buildbot on Windows on GitHub
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Reporter:  rutsky            |       Owner:
    Type:  enhancement       |      Status:  new
Priority:  patches-accepted  |   Milestone:  undecided
 Version:                    |  Resolution:
Keywords:                    |
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Comment (by rutsky):

 Initial !AppVeyor configuration done this this PR:
 https://github.com/buildbot/buildbot/pull/2019
 Now we need to fix failing on Windows tests.

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Ticket URL: <http://trac.buildbot.net/ticket/3405#comment:1>
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