Relax regression test for fsync check of backend-level stats
One test added in
9aea73fc61d4 did not take into account that the
backend may have some fsync even after a checkpoint. Let's relax it to
be more flexible.
Per report from buildfarm member grassquit, via Alexander Lakhin.
Author: Bertrand Drouvot
Discussion: https://postgr.es/m/
6143ab0a-9e88-4790-8d9d-
50ba45657761@gmail.com