bash-completion: use "list --format=csv" consistently
bash-completion: use "list --format=csv" consistently

Signed-off-by: Simon Deziel <088e16a1019277b15d58faf0541e11910eb756f6@sdeziel.info>

stgraber/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,atxwebs/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,atxwebs/lxd,atxwebs/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,hallyn/lxd,hallyn/lxd