After any checkpoint, close all smgr files handles in bgwriter

Simon Riggs <simon@2ndQuadrant.com>

Commit: 055c352abbf764a08496e94054137da9e26dac04
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2012-06-01T08:24:53Z
Releases: 9.2.0
After any checkpoint, close all smgr files handles in bgwriter

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