simplestreams: Align JSON struct for images.json
simplestreams: Align JSON struct for images.json

Signed-off-by: Daniele Rondina <e6db2050f2367c50810cd5562a413b83f513238e@sabayonlinux.org>

atxwebs/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,atxwebs/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,Skarlso/lxd,lxc/lxd,mjeanson/lxd,lxc/lxd,mjeanson/lxd,mjeanson/lxd,stgraber/lxd,atxwebs/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,Skarlso/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,Skarlso/lxd,Skarlso/lxd