Usage: /usr/bin/cert-to-efi-sig-list [-g <guid>] <crt file> <efi sig list file>
Take an input X509 certificate (in PEM format) and convert it to an EFI
signature list file containing only that single certificate

Options:
	-g <guid>        Use <guid> as the owner of the signature. If this is not
	                 supplied, an all zero guid will be used