Make some subquery-using test cases a bit more robust.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: b403ea43e40aae3ebb03cf3844cf84b43ab34b8a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-10-14T18:02:59Z
Releases: 12.0
Make some subquery-using test cases a bit more robust.

These test cases could be adversely affected by an upcoming change
to allow pullup of FROM-less subqueries.  Tweak them to ensure that
they'll continue to test what they did before.

Discussion: https://postgr.es/m/5395.1539275668@sss.pgh.pa.us

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