Implement dry-run mode for pg_archivecleanup

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: b2e431a4db81a735d1474c4d1565a20b835878c9
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2012-02-01T17:18:12Z
Releases: 9.2.0
Implement dry-run mode for pg_archivecleanup

In dry-run mode, just the name of the file to be removed is printed to
stdout; this is so the user can easily plug it into another program
through a pipe.  If debug mode is also specified, a more verbose message
is printed to stderr.

Author: Gabriele Bartolini
Reviewer: Josh Kupershmidt

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