gp_setup uses --ver, not --rel

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Make the tag=>sha1 check quiet when there is no tag

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Make tag before using it

Signed-off-by: David Greaves <david.greaves@jollamobile.com>