Thread: pgsql: Fix timing-sensitive regression test result I just created :-(

Log Message:
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Fix timing-sensitive regression test result I just created :-( --- the
DROP USER at the end of the cluster.sql test could fail, if the temp
table created in the previous session hadn't finished getting dropped.
Unluckily, I didn't see this in several repetitions of the parallel
regression tests, but it's popping up on quite a few buildfarm machines.

Modified Files:
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    pgsql/src/test/regress/expected:
        cluster.out (r1.21 -> r1.22)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/cluster.out?r1=1.21&r2=1.22)
    pgsql/src/test/regress/sql:
        cluster.sql (r1.13 -> r1.14)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/cluster.sql?r1=1.13&r2=1.14)