Fix up some misusage of appendStringInfo() and friends

Peter Eisentraut <peter_e@gmx.net>

Commit: 77d05706beb115b412728bd94dce16d83795583d
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-08-16T03:34:39Z
Releases: 11.0
Fix up some misusage of appendStringInfo() and friends

Change to appendStringInfoChar() or appendStringInfoString() where those
can be used.

Author: David Rowley <david.rowley@2ndquadrant.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>

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