test: Fix CreateVmRunner cleanup
test: Fix CreateVmRunner cleanup

Destroy its resources through addCleanup(), so that it also works on
test failures.

deryni/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,garrett/cockpit,garrett/cockpit,deryni/cockpit,mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpituous/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,deryni/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,martinpitt/cockpit