[HACKERS] simplify sequence test

We maintain a separate test output file sequence_1.out because the
log_cnt value can vary if there is a checkpoint happening at the right
time.  So we have to maintain two files because of a one character
difference.  I propose the attached patch to restructure the test a bit
to avoid this, without loss of test coverage.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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