pgsql: The beginnings of a regression test for plperl.

Log Message:
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The beginnings of a regression test for plperl.  Right now it only
covers return value processing, but that was the most broken stuff...

Added Files:
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    pgsql/src/pl/plperl/test:
        runtest (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/test/runtest?rev=1.1&content-type=text/x-cvsweb-markup)
        test.expected (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/test/test.expected?rev=1.1&content-type=text/x-cvsweb-markup)
        test_queries.sql (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/test/test_queries.sql?rev=1.1&content-type=text/x-cvsweb-markup)