[Buildbot] #3223: raise exception early if name is not compatible to be an identifier

[Buildbot trac]

#3223: raise exception early if name is not compatible to be an identifier
-----------------------+-----------------------
Reporter:  yarikoptic  |      Owner:
    Type:  undecided   |     Status:  new
Priority:  major       |  Milestone:  undecided
 Version:  0.8.10      |   Keywords:
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 exceptions.ValueError: Buildslave name u'nd14.04' is not a 50-character
              identifier

 because the name contained .  which is apparently illegit.  checkconfig
 was silent because name is not checked to be a valid identifier, and then
 only at run time puke happens

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Ticket URL: <http://trac.buildbot.net/ticket/3223>
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Buildbot: build/test automation