The filelock test heavily depends on the storage speed. Worse this
dependency is not linear as we issue 1000 attemps in parallel which is
quite a lot simultaneous writes. On my laptop with ssd vs. in-mem
location formula (time of 100 iterations) + 2e-5*no_players worked the
best.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>