Fix locale dependency in new ecpg test case.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: aae62278e167623bfac9fd50d1242d8e72208b0c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-08-25T18:17:33Z
Releases: 11.0
Fix locale dependency in new ecpg test case.

Force sorting in "C" locale so that the output ordering doesn't vary,
per buildfarm.

In passing, add missing .gitignore entries.

Discussion: https://postgr.es/m/0975f4bb-5dee-c33c-b719-3ce44026d397@chrullrich.net

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