[Buildbot] #3022: Provide a MatrixBuilderFactory

[Buildbot trac]

#3022: Provide a MatrixBuilderFactory
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Reporter:  Ben          |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  undecided
 Version:  master       |  Resolution:
Keywords:               |
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Comment (by Ben):

 My idea was not to channge the way builders work ! I just wanted to
 provide some utility classes that would do "the right things" (as we would
 expect it: create multiple builders, tie them to schedulers, slaves) given
 a set of handy parameters.

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Ticket URL: <http://trac.buildbot.net/ticket/3022#comment:2>
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