Fix multiple creation in vm module

1 job from unit_tests in 38 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #1122
unittest

00:38

 
Test unittest
    from interface_openstack.interface.storage.volume import Volume
ModuleNotFoundError: No module named 'interface_openstack'


----------------------------------------------------------------------
Ran 4 tests in 0.001s

FAILED (errors=4)
ERROR: Job failed: exit code 1