* src/remote/remote_driver.c (remote_driver): Add new callbacks.
* src/remote/remote_protocol.x (remote_procedure): New RPCs.
(remote_domain_save_image_get_xml_desc_args)
(remote_domain_save_image_get_xml_desc_ret)
(remote_domain_save_image_define_xml_args): New structs.
* src/remote_protocol-structs: Update.