Simplify sequence test

Peter Eisentraut <peter_e@gmx.net>

Commit: 9c18104c7448a0cdaa46aed1b9504439879f327e
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-01-26T20:23:25Z
Releases: 10.0
Simplify sequence test

We maintained two separate expected files because log_cnt could be one
of two values.  Rewrite the test so that we only need one file.

Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>

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