Add expected isolationtester output when prepared xacts are disabled

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 0b298bd7a1782fca621068a5e17681be207f5635
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2011-08-25T20:45:57Z
Releases: 9.1.0
Add expected isolationtester output when prepared xacts are disabled

This was deemed unnecessary initially but in later discussion it was
agreed otherwise.

Original file from Kevin Grittner, allegedly from Dan Ports.
I had to clean up whitespace a bit per changes from Heikki.

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