In AtEOXact_Files, complain if any files remain unclosed at commit.

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

Commit: 9cb7db3f0c1f554cdcbbd97f78a119a19756e6ef
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-04-28T21:45:02Z
Releases: 11.0
In AtEOXact_Files, complain if any files remain unclosed at commit.

This change makes this module act more like most of our other low-level
resource management modules.  It's a caller error if something is not
explicitly closed by the end of a successful transaction, so issue
a WARNING about it.  This would not actually have caught the file leak
bug fixed in commit 231bcd080, because that was in a transaction-abort
path; but it still seems like a good, and pretty cheap, cross-check.

Discussion: https://postgr.es/m/152056616579.4966.583293218357089052@wrigleys.postgresql.org

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