Handle AT_ReAddComment in test_ddl_deparse, and add a catch-all default.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 13f2db2ffb2fac24fcb57ecc56e030e1145df127
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-07-20T07:25:26Z
Releases: 9.6.0
Handle AT_ReAddComment in test_ddl_deparse, and add a catch-all default.

In the passing, also move AT_ReAddComment to more logical position in the
enum, after all the Constraint-related subcommands.

This fixes a compiler warning, added by commit e42375fc. Backpatch to 9.5,
like that patch.

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