PL/Python: Fix tests for older Python versions

Peter Eisentraut <peter_e@gmx.net>

Commit: f498704346a4ce4953fc5f837cacb545b3166ee1
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-01-22T17:09:52Z
Releases: 11.0
PL/Python: Fix tests for older Python versions

Commit 8561e4840c81f7e345be2df170839846814fa004 neglected to handle
older Python versions that don't support the "with" statement.  So write
the tests in a way that older versions can handle as well.

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