pgsql: PL/Python: Adjust the regression tests for Python 3.3

PL/Python: Adjust the regression tests for Python 3.3

Similar to 2cfb1c6f77734db81b6e74bcae630f93b94f69be, the order in which
dictionary elements are printed is not reliable.  This reappeared in the
tests of the string representation of result objects.  Reduce the test
case to one result set column so that there is no question of order.

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/7f288a23484971dca7f75d866d0f1edb332fbc4b

Modified Files
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src/pl/plpython/expected/plpython_spi.out |    8 ++++----
src/pl/plpython/sql/plpython_spi.sql      |    2 +-
2 files changed, 5 insertions(+), 5 deletions(-)