Update random() usage so ranges are inclusive/exclusive as required.

Bruce Momjian <bruce@momjian.us>

Commit: 59bb147353ba274e0836d06f429176d4be47452c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2006-02-03T12:45:47Z
Releases: 8.2.0
Update random() usage so ranges are inclusive/exclusive as required.

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