lxd/util: Update to changed cert functions
lxd/util: Update to changed cert functions

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

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