tests: give firewallvm more time to apply the rules
tests: give firewallvm more time to apply the rules

Not everyone use fast SSD drive and 4+ core CPU...

marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin