[Buildbot] #3419: tests are failing when using PostgreSQL database backend

[Buildbot trac]

#3419: tests are failing when using PostgreSQL database backend
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Reporter:  rutsky     |       Owner:  dustin
    Type:  undecided  |      Status:  assigned
Priority:  major      |   Milestone:  undecided
 Version:  master     |  Resolution:
Keywords:             |
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Comment (by rutsky):

 Error log with your PR is a bit shorter, than without your changes, so I
 think your changes fixing something on `psycopg2` driver too :)

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Ticket URL: <http://trac.buildbot.net/ticket/3419#comment:8>
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