tests: set expected num of containers to 20
tests: set expected num of containers to 20

changelog: none

Signed-off-by: mchalczynski <3a897b56ed6fc284ae11e3e7ec3ea48d098a7178@rndity.com>

pasinskim/integration,GregorioDiStefano/integration,pasinskim/integration,GregorioDiStefano/integration,pasinskim/integration