refactor in libcloud: rename ex_add_nic_to_node/ex_remove_nic_from_node to ex_attach/detach
refactor in libcloud: rename ex_add_nic_to_node/ex_remove_nic_from_node to ex_attach/detach

cloudify-cosmo/cloudify-cloudstack-plugin,cloudify-cosmo/cloudify-cloudstack-plugin