iSCSI: Add --no-key option
iSCSI: Add --no-key option

When the usecase do not need the creation of a new temporal ssh key,
we can use --no-key to disable the creation of it.

This can help when crowbar is actually deployed and chef-client is
taking care of ~/.ssh/authorized_keys for us.

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