[Buildbot] #3183: fix network "spottiness" on new infra

[Buildbot trac]

#3183: fix network "spottiness" on new infra
---------------------+--------------------------
Reporter:  dustin    |       Owner:  verm
    Type:  defect    |      Status:  closed
Priority:  critical  |   Milestone:  sys - other
 Version:            |  Resolution:  fixed
Keywords:            |
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Comment (by dustin):

 Hm, I did just get another
 {{{
      "msg": "fatal: Unable to look up github.com (port 9418) (hostname nor
 servname provided, or not known)",
 }}}
 from bslave1.  That's not promising, but if it's the last one I see I'll
 be willing to chalk it up to carryover state.

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Ticket URL: <http://trac.buildbot.net/ticket/3183#comment:40>
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