Attempt to stabilize partition_prune test output.

Andrew Gierth <rhodiumtoad@postgresql.org>

Commit: b47a86f5008f2674af20dd00bc233e7b74e01bba
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Date: 2018-04-08T05:35:42Z
Releases: 11.0
Attempt to stabilize partition_prune test output.

Disable index-only scan for tests that might report variable results
for "Heap Fetches" statistic due to concurrent transactions affecting
whether all-visible flags can be set.

Author: David Rowley
Discussion: https://postgr.es/m/CAKJS1f_yjtHDJnDzx1uuR_3D7beDVAkNQfWJhRLA1gvPCzkAhg@mail.gmail.com

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