tests/local-pull: test "--sign-verify" option
tests/local-pull: test "--sign-verify" option

Ensure what with this option only signed commit is pulled.

Signed-off-by: Denis Pynkin <3fbf95ee68899518ee8799d35f88c8f7982aa936@collabora.com>

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