[Bugs] #1867 HIGH: fix buildbot after upgrade to 0.7.12

[Sugar Labs Bugs]

#1867: fix buildbot after upgrade to 0.7.12
-------------------------------+--------------------------------------------
    Reporter:  sascha_silbe    |          Owner:  sascha_silbe  
        Type:  defect          |         Status:  new           
    Priority:  High            |      Milestone:  not applicable
   Component:  infrastructure  |        Version:  Unspecified   
    Severity:  Blocker         |       Keywords:                
Distribution:  Unspecified     |   Status_field:  Assigned      
-------------------------------+--------------------------------------------
 After upgrading buildbot to 0.7.12 and making sure it actually gets picked
 up this time (we were still running with a local copy of 0.7.10 instead of
 the 0.7.11p3 in sugar-jhbuild) it's broken because of
 [https://bugzilla.gnome.org/show_bug.cgi?id=613917 Gnome#613917].

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Ticket URL: <https://bugs.sugarlabs.org/ticket/1867>
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