[Buildbot] #3374: Whitelist config keys exposed in the config endpoint

[Buildbot trac]

#3374: Whitelist config keys exposed in the config endpoint
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Reporter:  dustin    |       Owner:
    Type:  defect    |      Status:  new
Priority:  critical  |   Milestone:  0.9.+
 Version:  0.9.0b4   |  Resolution:
Keywords:            |
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Changes (by dustin):

 * milestone:  0.9.0 => 0.9.+


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Ticket URL: <http://trac.buildbot.net/ticket/3374#comment:1>
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