lxc/list: Use consistent units
lxc/list: Use consistent units

Signed-off-by: Ryan Bethke <febc7857e280f8199f909628805cc08e2e5c56dc@utexas.edu>

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