[Buildbot] #3223: detect builder and buildslave names that are not identifiers during configtest

[Buildbot trac]

#3223: detect builder and buildslave names that are not identifiers during
configtest
-----------------------+-----------------------
Reporter:  yarikoptic  |       Owner:  dustin
    Type:  defect      |      Status:  assigned
Priority:  major       |   Milestone:  0.9.0
 Version:  0.8.10      |  Resolution:
Keywords:  simple      |
-----------------------+-----------------------
Changes (by dustin):

 * owner:   => dustin
 * status:  new => assigned


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Ticket URL: <http://trac.buildbot.net/ticket/3223#comment:2>
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