Don't make unnecessary image copies
Don't make unnecessary image copies

Closes #2508

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

lxc/lxd,akshaykarle/lxd,hallyn/lxd,pcdummy/lxd,stgraber/lxd,stgraber/lxd,mjeanson/lxd,erikmack/lxd,Skarlso/lxd,Skarlso/lxd,ollie314/lxd,chrisglass/lxd,Skarlso/lxd,stgraber/lxd,atxwebs/lxd,ollie314/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,techtonik/lxd,georghopp/lxd,lxc/lxd,georghopp/lxd,lxc/lxd,atxwebs/lxd,atxwebs/lxd,chrisglass/lxd,lxc/lxd,techtonik/lxd,jsavikko/lxd,hallyn/lxd,pcdummy/lxd,akshaykarle/lxd,erikmack/lxd,atxwebs/lxd,akshaykarle/lxd,stgraber/lxd,techtonik/lxd,mjeanson/lxd,hallyn/lxd,lxc/lxd,chrisglass/lxd,stgraber/lxd,stgraber/lxd,jsavikko/lxd,pcdummy/lxd,ollie314/lxd,erikmack/lxd,hallyn/lxd,Skarlso/lxd,lxc/lxd,mjeanson/lxd,stgraber/lxd,georghopp/lxd,jsavikko/lxd