python - be: Add VPC and LIMIT'd VPC tests.

Log Message:
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Add VPC and LIMIT'd VPC tests.

Modified Files:
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be/test/expected/80:
srf (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/expected/80/srf.diff?r1=1.1&r2=1.2)
be/test/expected/81:
srf (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/expected/81/srf.diff?r1=1.1&r2=1.2)
be/test/sql/80:
srf (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/sql/80/srf.diff?r1=1.1&r2=1.2)
be/test/sql/81:
srf (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/sql/81/srf.diff?r1=1.1&r2=1.2)