Clean up code, comments, and formatting for table partitioning.

Robert Haas <rhaas@postgresql.org>

Commit: 4b9a98e154cec81849af24091443747a6057c968
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-12-13T15:59:14Z
Releases: 10.0
Clean up code, comments, and formatting for table partitioning.

Amit Langote, plus pgindent-ing by me.  Inspired in part by review
comments from Tomas Vondra.

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