PL/Python: Adjust the regression tests for Python 3.4

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 582b41d6e21dd1324c2bab67ace04b74591f8dd9
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-06-01T19:03:18Z
Releases: 9.2.9
PL/Python: Adjust the regression tests for Python 3.4

Back-patch commit d0765d50f429472d00554701ac6531c84d324811 into 9.3
and 9.2, which is as far back as we previously bothered to adjust the
regression tests for Python 3.3.  Per gripe from Honza Horak.

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