Improve stability of new CSC eviction test #8160
Merged
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c4fdf09 added a test that now fails with valgrind
it fails for two resons:
that value, but it turns out this is not atomic and on slow machines
the background cron process that clean out old query buffers reduces
the memory so that the setting doesn't cause eviction.
by that time more and more keys got evicted, partially draining the
db. this is not the focus of this fix (still a known limitation)