python - be: Add tests to validate the use of in session replacements.

Log Message:
-----------
Add tests to validate the use of in session replacements.

Simply: create, select, create or replace, select, repeat a few times more.

Modified Files:
--------------
    be/test/expected/80:
        fund (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/expected/80/fund.diff?r1=1.3&r2=1.4)
    be/test/expected/81:
        fund (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/expected/81/fund.diff?r1=1.1&r2=1.2)
    be/test/sql/80:
        fund (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/sql/80/fund.diff?r1=1.2&r2=1.3)
    be/test/sql/81:
        fund (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/test/sql/81/fund.diff?r1=1.1&r2=1.2)