tests: TestMachines: testCreate: storage size is not a mandatory parameter
tests: TestMachines: testCreate: storage size is not a mandatory parameter

When needed it should be written explicitely because for some
installation methods it's not neeeded; for example when importing
existing disk image.

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