[Buildbot] #3025: Fix Bitbucket hook for 0.8.10

[Buildbot trac]

#3025: Fix Bitbucket hook for 0.8.10
-------------------+-------------------
Reporter:  blalor  |      Owner:
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  0.8.x
 Version:  0.8.9   |   Keywords:
-------------------+-------------------
 Related to #2981, the fix is already on master, but needs to be brought to
 the eight branch for the upcoming 0.8.10 release.

--
Ticket URL: <http://trac.buildbot.net/ticket/3025>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation