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Teach pg_ls_dir_files() to ignore ENOENT failures from stat().

Buildfarm experience shows that this function can fail with ENOENTif some other process unlinks a file between when we read the directoryentry and when we try to stat() it. The problem is old but we hadnot noticed it until085b6b6 added regression test coverage.To fix, just ignore ENOENT failures. There is one other case thatthis might hide: a symlink that points to nowhere. That seems okaythough, at least better than erroring.Back-patch to v10 where this function was added, since the regressiontest cases were too.Discussion:https://postgr.es/m/20200308173103.GC1357@telsasoft.com

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src/backend/utils/adt
- genfile.c

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`‎src/backend/utils/adt/genfile.c`

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Original file line number	Diff line number	Diff line change
`@@ -597,9 +597,14 @@ pg_ls_dir_files(FunctionCallInfo fcinfo, const char *dir, bool missing_ok)`
`597`	`597`	`/* Get the file info */`
`598`	`598`	`snprintf(path,sizeof(path),"%s/%s",dir,de->d_name);`
`599`	`599`	`if (stat(path,&attrib)<0)`
	`600`	`+{`
	`601`	`+/* Ignore concurrently-deleted files, else complain */`
	`602`	`+if (errno==ENOENT)`
	`603`	`+continue;`
`600`	`604`	`ereport(ERROR,`
`601`	`605`	`(errcode_for_file_access(),`
`602`	`606`	`errmsg("could not stat file \"%s\": %m",path)));`
	`607`	`+}`
`603`	`608`
`604`	`609`	`/* Ignore anything but regular files */`
`605`	`610`	`if (!S_ISREG(attrib.st_mode))`

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Commit82e8018

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`‎src/backend/utils/adt/genfile.c`

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