tests: fix removing test VMs
tests: fix removing test VMs

Do it before shutting down qubesd socket - some things may require it
for VM removal/shutdown.

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