tests/libtest: Record long GPG key IDs and fingerprints
tests/libtest: Record long GPG key IDs and fingerprints

Use long GPG key IDs as it's safer and matches the format used by gpg
and gpgme. Add the associated fingerprints since these are needed by gpg
when manipulating keys.

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree