initdb: Use atexit()

Replace exit_nicely() calls with standard exit() and register the
cleanup actions using atexit().  The coding pattern used here mirrors
existing use in pg_basebackup.c.

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

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/3913a40ff104fd26f795c3d4c402ec27a1f86385

Modified Files
--------------
src/bin/initdb/initdb.c | 82 ++++++++++++++++++++++++++-----------------------
1 file changed, 43 insertions(+), 39 deletions(-)

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