Revert "Still further tweaking of deadlock isolation tests."

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

Commit: 3992188c2a8702bcb92140a840b5378b27468921
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-02-12T22:02:59Z
Releases: 9.6.0
Revert "Still further tweaking of deadlock isolation tests."

This reverts commit d03130d378b5fb071d231a7822784ad87268583a.
That was dependent on an isolationtester.c change that now proves
to be broken; we will need to find another solution.

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