Fix further hash table order dependent tests.

Andres Freund <andres@anarazel.de>

Commit: ccbb852cd6101e93976111676a90f1e5d9268951
Author: Andres Freund <andres@anarazel.de>
Date: 2016-10-13T01:31:45Z
Releases: 10.0
Fix further hash table order dependent tests.

Similar to 0137caf273, this makes contrib and pl tests less dependant on
hash-table order.  After this commit, at least some order affecting
changes to execGrouping.c don't result in regression test changes
anymore.

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