mkcloud: Add adminvcpus parameter
mkcloud: Add adminvcpus parameter

When running multiple nodes on limited hardware it's useful to set the
number of vcpus on the admin node independent from the other nodes.

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