isolationtester: Use atexit()

Replace exit_nicely() calls with standard exit() and register the
cleanup actions using atexit().

Reviewed-by: Alvaro Herrera <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/[email protected]/

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/be2e329f2e700032df087e08ac2103ba3d1fa811

Modified Files
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src/test/isolation/isolationtester.c | 42 ++++++++++++++++--------------------
1 file changed, 19 insertions(+), 23 deletions(-)

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