postgres_fdw: Modify regression tests for EPQ-related planning problems.
This prevents the tests added by commit
4bbf6edfbd and adjusted by
commit
99f6a17dd6 from being useless by plan changes created by an
upcoming commit.
Author: Etsuro Fujita
Discussion: https://postgr.es/m/87pnz1aby9.fsf@news-spur.riddles.org.uk