Re: [libvirt] [PATCH 2/3] docs: schemas: Add 'seclabel' for external disk snapshot

Allow using seclabels the same way as disk images allow it. Currently the snapshot code copies the seclabels from the original image if no seclabel is provided. Also there's no code change required as the snapshot XML parser actually uses parts of the disk parser thus seclabels are already parsed and formatted and even applied thus this is just a formalization of our support for this.