pgsql: PL/Python: Make regression tests pass with older Python versions

PL/Python: Make regression tests pass with older Python versions

Avoid output formatting differences by printing str() instead of repr()
of the value.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/8182ffde5aa09d8378caa599d70e0d4e02ea8d7d

Modified Files
--------------
src/pl/plpython/expected/plpython_types.out | 18 +++++++++---------
src/pl/plpython/expected/plpython_types_3.out | 18 +++++++++---------
src/pl/plpython/sql/plpython_types.sql | 2 +-
3 files changed, 19 insertions(+), 19 deletions(-)

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