PL/Python: Adjust the regression tests for Python 3.4

Peter Eisentraut <peter_e@gmx.net>

Commit: d0765d50f429472d00554701ac6531c84d324811
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2014-04-30T02:16:16Z
Releases: 9.4.0
PL/Python: Adjust the regression tests for Python 3.4

The error test case in the plpython_do test resulted in a slightly
different error message with Python 3.4.  So pick a different way to
test it that avoids that and is perhaps also a bit clearer.

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