mkcloud: check for VG before calling pvcreate
mkcloud: check for VG before calling pvcreate

this is needed after commit 10c8e65944c7

gosipyan/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,gosipyan/automation,aspiers/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,SUSE-Cloud/automation