[Buildbot] #3254: gitlab merge request webhook should trigger a try build

[Buildbot trac]

#3254: gitlab merge request webhook should trigger a try build
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Reporter:  dank         |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  undecided
 Version:  0.8.12       |  Resolution:
Keywords:               |
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Comment (by sa2ajj):

 Dan, do you think you could submit a PR with this script in
 `master/contrib`?

 If not, I could do this on your behalf.

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Ticket URL: <http://trac.buildbot.net/ticket/3254#comment:1>
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