Invent on_exit_nicely for pg_dump.

Robert Haas <rhaas@postgresql.org>

Commit: e9a22259c45e235aaa30f0d068f767d9c0f818a0
Author: Robert Haas <rhaas@postgresql.org>
Date: 2012-02-16T16:49:20Z
Releases: 9.2.0
Invent on_exit_nicely for pg_dump.

Per recent discussions on pgsql-hackers regarding parallel pg_dump.

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